1. A
   -13
2. B
   -5
3. C
   5
4. D
   7

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1. A
   12
2. B
   24
3. C
   30
4. D
   36

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1. A
   10
2. B
   12
3. C
   17
4. D
   21

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1. A
   $x-4y+5=0$
2. B
   $3x+2y-1=0$
3. C
   $x+4y+1=0$
4. D
   $5x-4y+1=0$

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1. A
   6
2. B
   4
3. C
   2
4. D
   1

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1. A
   1
2. B
   2
3. C
   3
4. D
   3.5

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1. A
   7
2. B
   4
3. C
   1
4. D
   0

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1. A
   $\dfrac{1}{12}$
2. B
   $\dfrac{1}{7}$
3. C
   $\dfrac{2}{9}$
4. D
   $\dfrac{1}{4}$

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1. A
   1
2. B
   4
3. C
   $n-1$
4. D
   $n$

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1. A
   $2-\dfrac{1}{2^{n+1}}$
2. B
   $2-\dfrac{1}{2^{n-1}}$
3. C
   $2+\dfrac{1}{2^{n-1}}$
4. D
   $2-\dfrac{1}{2^{n}}$

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1. A
   $P$
2. B
   $\dfrac{Q}{2}$
3. C
   $2Q$
4. D
   $R$

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1. A
   $\dfrac{6}{7}$
2. B
   $\dfrac{32}{70}$ (i.e. $\dfrac{16}{35}$)
3. C
   $\dfrac{3}{10}$
4. D
   $\dfrac{1}{70}$

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1. A
   $\dfrac{1}{9}$
2. B
   $\dfrac{1}{18}$
3. C
   $\dfrac{1}{27}$
4. D
   $\dfrac{1}{3}$

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1. A
   1
2. B
   $\dfrac{1}{4}$
3. C
   $\dfrac{3}{7}$
4. D
   $\dfrac{2}{7}$

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1. A
   $\dfrac{23}{25}$
2. B
   $\dfrac{47}{50}$
3. C
   $\dfrac{24}{25}$
4. D
   $\dfrac{49}{50}$

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