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# Topic 1 All - Number & Algebra

All Questions for Topic 1 (Number & Algebra). Sequences & Series, Exponents & Logs, Binomial Theorem, Proofs

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##### Question 1

no calculator

easy

[Maximum mark: 6]

Consider an arithmetic sequence $2,6,10,14,\dots$

1. Find the common difference, $d$. [2]

2. Find the $10$th term in the sequence. [2]

3. Find the sum of the first $10$ terms in the sequence. [2]

easy

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##### Question 2

calculator

easy

[Maximum mark: 6]

An arithmetic sequence has $u_1= 40$, $u_2 = 32$, $u_3 = 24$.

1. Find the common difference, $d$. [2]

2. Find $u_8$. [2]

3. Find $S_8$. [2]

easy

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##### Question 3

no calculator

easy

[Maximum mark: 6]

Find the value of each of the following, giving your answer as an integer.

1. $\log_6 6$. [2]

2. $\log_6 9 + \log_6 4$. [2]

3. $\log_6 72 - \log_6 2$. [2]

easy

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##### Question 4

no calculator

easy

[Maximum mark: 7]

Find the value of each of the following, giving your answer as an integer.

1. $\log_{10} 100$. [2]

2. $\log_{10} 50 + \log_{10} 2$. [2]

3. $\log_{10} 4 - \log_{10} 40$. [3]

easy

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##### Question 5

no calculator

easy

[Maximum mark: 4]

Expand $(2x + 1)^4$ in descending powers of $x$ and simplify your answer.

easy

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##### Question 6

calculator

easy

[Maximum mark: 6]

Only one of the following four sequences is arithmetic and only one of them is geometric.

$\begin{array}{rcccccl} a_n &=& 1,\,5,\,10,\,15,\,\dots &\,\hspace{4em}\,& c_n &=& 1.5,\,3,\,4.5,\,6,\,\dots \\[12pt] b_n &=& \dfrac{1}{2},\,\dfrac{2}{3},\,\dfrac{3}{4},\,\dfrac{4}{5},\,\dots &\,\hspace{4em}\,& d_n &=& 2,\,1,\,\dfrac{1}{2},\,\dfrac{1}{4},\,\dots \end{array}$
1. State which sequence is arithmetic and find the common difference of the sequence. [2]

2. State which sequence is geometric and find the common ratio of the sequence.[2]

3. For the geometric sequence find the exact value of the eighth term. Give your answer as a fraction. [2]

easy

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##### Question 7

calculator

easy

[Maximum mark: 6]

Only one of the following four sequences is arithmetic and only one of them is geometric.

$\begin{array}{rcccccl} a_n &=& \dfrac{1}{3},\,\dfrac{1}{4},\,\dfrac{1}{5},\,\dfrac{1}{6},\,\dots &\,\hspace{4em}\,& c_n &=& 3,\,1,\,\dfrac{1}{3},\,\dfrac{1}{9},\,\dots \\[12pt] b_n &=& 2.5,\,5,\,7.5,\,10,\,\dots &\,\hspace{4em}\,& d_n &=& 1,\,3,\,6,\,10,\,\dots \end{array}$
1. State which sequence is arithmetic and find the common difference of the sequence. [2]

2. State which sequence is geometric and find the common ratio of the sequence.[2]

3. For the geometric sequence find the exact value of the sixth term. Give your answer as a fraction. [2]

easy

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##### Question 8

calculator

easy

[Maximum mark: 6]

Consider the infinite geometric sequence $4480$, $-3360$, $2520$, $-1890,\dots$

1. Find the common ratio, $r$. [2]

2. Find the $20$th term. [2]

3. Find the exact sum of the infinite sequence. [2]

easy

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##### Question 9

calculator

easy

[Maximum mark: 6]

The table shows the first four terms of three sequences: $u_n$, $v_n$, and $w_n$.

1. State which sequence is

1. arithmetic;

2. geometric. [2]

2. Find the sum of the first $50$ terms of the arithmetic sequence. [2]

3. Find the exact value of the $13$th term of the geometric sequence. [2]

easy

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##### Question 10

calculator

easy

[Maximum mark: 4]

Expand $(2x - 3)^4$ in descending powers of $x$ and simplify your answer.

easy

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##### Question 11

no calculator

easy

[Maximum mark: 4]

Consider two consecutive positive integers, $k$ and $k+1$.

Show that the difference of their squares is equal to the sum of the two integers.

easy

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##### Question 12

no calculator

easy

[Maximum mark: 4]

Prove that the sum of three consecutive positive integers is divisible by $3$.

easy

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##### Question 13

no calculator

easy

[Maximum mark: 4]

The product of three consecutive integers is increased by the middle integer.

Prove that the result is a perfect cube.

easy

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##### Question 14

no calculator

easy

[Maximum mark: 7]

An arithmetic sequence is given by $3$, $5$, $7,\dots$

1. Write down the value of the common difference, $d$. [1]

2. Find

1. $u_{10}$;

2. $S_{10}$. [4]

3. Given that $u_n = 253$, find the value of $n$. [2]

easy

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##### Question 15

calculator

easy

[Maximum mark: 6]

Consider the infinite geometric sequence $9000$, $-7200$, $5760$, $-4608$, ...

1. Find the common ratio. [2]

2. Find the $25$th term. [2]

3. Find the exact sum of the infinite sequence. [2]

easy

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##### Question 16

no calculator

easy

[Maximum mark: 7]

Let $p=\ln 2$ and $q = \ln 6$. Write down the following expressions in terms of $p$ and $q$.

1. $\ln 12$ [2]

2. $\ln 3$ [2]

3. $\ln 48$ [3]

easy

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##### Question 17

no calculator

easy

[Maximum mark: 7]

Let $a=\ln 2$ and $b = \ln 10$. Write down the $\text{following}$ $\text{expressions}$ in terms of $a$ and $b$.

1. $\ln 20$ [2]

2. $\ln 5$ [2]

3. $\ln 160$ [3]

easy

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##### Question 18

no calculator

easy

[Maximum mark: 6]

Let $\log_2 a = p$, $\log_2 b = q$, $\log_2 c = r$. Write down the following expressions in terms of $p$, $q$ and $r$.

1. $\log_2\Big(\dfrac{ab}{c}\Big)$ [2]

2. $\log_2\Big(\dfrac{a^2c}{b^3}\Big)$ [2]

3. $\log_a b$ [2]

easy

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##### Question 19

no calculator

easy

[Maximum mark: 5]

Consider the expansion of $(x+2)^5$.

1. Write down the number of terms in this expansion. [1]

2. Find the term in $x^3$. [4]

easy

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##### Question 20

calculator

easy

[Maximum mark: 6]

Consider the expansion of $(2x-1)^9$.

1. Write down the number of terms in this expansion. [1]

2. Find the coefficient of the term in $x^2$. [5]

easy

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##### Question 21

no calculator

easy

[Maximum mark: 6]

Consider the following sequence of figures.

Figure 1 contains $6$ line segments.

1. Given that Figure $n$ contains $101$ line segments, show that $n = 20$.[3]

2. Find the total number of line segments in the first $20$ figures. [3]

easy

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##### Question 22

no calculator

easy

[Maximum mark: 5]

Consider an arithmetic sequence where $u_{12} = S_{12} = 12$. Find the value of the first term, $u_1$, and the value of the common difference, $d$.

easy

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##### Question 23

no calculator

easy

[Maximum mark: 6]

Let $\log_3 p = u$, $\log_3 q = v$, $\log_3 r = w$. Write down the following expressions in terms of $u$, $v$ and $w$.

1. $\log_3\Big(\dfrac{r}{pq}\Big)$ [2]

2. $\log_3\Big(\dfrac{p^4r}{q^5}\Big)$ [2]

3. $\log_{pq} r$ [2]

easy

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##### Question 24

no calculator

easy

[Maximum mark: 6]

Let $a = \log_5b$, where $b > 0$. Write down each of the following expressions
in terms of $a$.

1. $\log_5b^4$ [2]

2. $\log_5 (25b)$ [2]

3. $\log_{25}b$ [2]

easy

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##### Question 25

calculator

easy

[Maximum mark: 6]

Consider the expansion of $x(3x+2)^7$.

1. Write down the number of terms in this expansion. [1]

2. Find the coefficient of the term in $x^3$. [5]

easy

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##### Question 26

calculator

easy

[Maximum mark: 6]

A tennis ball bounces on the ground $n$ times. The heights of the bounces, $h_1, h_2, h_3, \dots,h_n,$ form a geometric sequence. The height that the ball bounces the first time, $h_1$, is $80$ cm, and the second time, $h_2$, is $60$ cm.

1. Find the value of the common ratio for the sequence. [2]

2. Find the height that the ball bounces the tenth time, $h_{10}$. [2]

3. Find the total distance travelled by the ball during the first six bounces (up and down). Give your answer correct to $2$ decimal places. [2]

easy

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##### Question 27

calculator

easy

[Maximum mark: 6]

The third term, $u_3$, of an arithmetic sequence is $7$. The common difference of
the sequence, $d$, is $3$.

1. Find $u_1$, the first term of the sequence. [2]

2. Find $u_{60}$, the $60$th term of sequence. [2]

The first and fourth terms of this arithmetic sequence are the first two terms
of a geometric sequence.

1. Calculate the sixth term of the geometric sequence. [2]

easy

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##### Question 28

calculator

easy

[Maximum mark: 6]

The fifth term, $u_5$, of a geometric sequence is $125$. The sixth term, $u_6$, is $156.25$.

1. Find the common ratio of the sequence. [2]

2. Find $u_1$, the first term of the sequence. [2]

3. Calculate the sum of the first $12$ terms of the sequence. [2]

easy

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##### Question 29

calculator

easy

[Maximum mark: 6]

The fourth term, $u_4$, of a geometric sequence is $135$. The fifth term, $u_5$, is $81$.

1. Find the common ratio of the sequence. [2]

2. Find $u_1$, the first term of the sequence. [2]

3. Calculate the sum of the first $20$ terms of the sequence. [2]

easy

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##### Question 30

calculator

easy

[Maximum mark: 6]

The fifth term, $u_5$, of an arithmetic sequence is $25$. The eleventh term, $u_{11}$, of the same sequence is $49$.

1. Find $d$, the common difference of the sequence. [2]

2. Find $u_1$, the first term of the sequence. [2]

3. Find $S_{100}$, the sum of the first $100$ terms of the sequence. [2]

easy

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##### Question 31

calculator

easy

[Maximum mark: 6]

In an arithmetic sequence, $u_5 = 24$, $u_{13} = 80$.

1. Find the common difference. [2]

2. Find the first term. [2]

3. Find the sum of the first $20$ terms in the sequence. [2]

easy

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##### Question 32

no calculator

easy

[Maximum mark: 6]

The first three terms of a geometric sequence are $u_1 = 32$, $u_2 = -16$, $u_3 = 8$.

1. Find the value of the common ratio, $r$. [2]

2. Find $u_6$. [2]

3. Find $S_{\infty}$. [2]

easy

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##### Question 33

no calculator

easy

[Maximum mark: 6]

In an arithmetic sequence, $u_4 = 12$, $u_{11} = -9$.

1. Find the common difference. [2]

2. Find the first term. [2]

3. Find the sum of the first $11$ terms in the sequence. [2]

easy

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##### Question 34

calculator

easy

[Maximum mark: 5]

In an arithmetic sequence, the sum of the 2nd and 6th term is $32$.
Given that the sum of the first six terms is $120$, determine the first term and common difference of the sequence.

easy

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##### Question 35

calculator

easy

[Maximum mark: 5]

An arithmetic sequence has first term $45$ and common difference $-1.5$.

1. Given that the $k$th term of the sequence is zero, find the value of $k$. [2]

Let $S_n$ denote the sum of the first $n$ terms of the sequence.

1. Find the maximum value of $S_n$. [3]

easy

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