1. A
   1 only
2. B
   2 only
3. C
   Both 1 and 2
4. D
   Neither 1 nor 2

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1. A
   42
2. B
   35
3. C
   28
4. D
   21

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1. A
   $C(51,25)$
2. B
   $C(51,27)$
3. C
   $C(51,51)-C(51,0)$
4. D
   $C(51,25)-C(51,27)$

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1. A
   $C(2n,n)x$
2. B
   $C(2n,n-1)x$
3. C
   $C(2n,n)$
4. D
   $C(2n,n-1)$

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1. A
   $2^n$
2. B
   $3^n$
3. C
   $2^{2n}$
4. D
   $3^{2n}$

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1. A
   1 only
2. B
   2 only
3. C
   Both 1 and 2
4. D
   Neither 1 nor 2

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1. A
   10
2. B
   8
3. C
   6
4. D
   5

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1. A
   2
2. B
   3
3. C
   4
4. D
   5

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1. A
   $^{m+1}C_4$
2. B
   $2\times\,^{m+1}C_4$
3. C
   $3\times\,^{m+1}C_4$
4. D
   $^{m+2}C_4$

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1. A
   The coefficient of $x^{100}$
2. B
   The coefficient of $x^{99}$
3. C
   The coefficient of $x^{51}$
4. D
   The coefficient of $x^{50}$

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1. A
   $1.1\times2^8$
2. B
   $1.2\times7^4$
3. C
   5.5
4. D
   0.55

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1. A
   $4$
2. B
   $5$
3. C
   $6$
4. D
   $7$

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1. A
   $1$
2. B
   $2$
3. C
   $4$
4. D
   $8$

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1. A
   $5$
2. B
   $6$
3. C
   $7$
4. D
   $8$

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1. A
   Third
2. B
   Fourth
3. C
   Fifth
4. D
   Ninth

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