Practice MCQs for JEE Mathematics Binomial Theorem for Positive Integral Index
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Access Binomial Theorem for Positive Integral Index Questions and Solutions
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Multiple Choice Questions
(a) 27
(b) 9
(c) 3
(d) none of these
Show Answer & Explanation
Answer: (b) 9
Explanation:
1. f(1) = 10 + 192 + 5 = 207 = 9 × 23 and f(2) = 100 + 768 + 5 = 873 = 9 × 97.
2. Their gcd is 9, so no larger integer can work.
3. Check: \( 10^n=(1+9)^n\equiv1 \) and \( 4^{n+2}=(1+3)^{n+2}\equiv1+3(n+2) \) modulo 9, so f(n) ≡ 1 + 3 + 9(n+2) + 5 ≡ 0 modulo 9.
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(a) 1
(b) 6
(c) 5
(d) 2
Show Answer & Explanation
Answer: (a) 1
Explanation:
1. \( 2^3=8=7+1 \), so \( 2^{60}=(2^3)^{20}=(7+1)^{20} \).
2. Every term except the last is a multiple of 7 and the last is 1. Remainder = 1.
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87. .
(a) \( \frac38 \)
(b) \( \frac78 \)
(c) \( \frac18 \)
(d) none of these
Show Answer & Explanation
Answer: (c) \( \frac18 \)
Explanation:
1. \( 3^{2n}=9^n=(8+1)^n \).
2. All terms except the last are multiples of 8, so the remainder is 1 and the fractional part is \( \frac18 \).
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65. .
(a) \( {}^{8}C_{4} \)
(b) \( 16\cdot{}^8C_4 \)
(c) \( {}^6C_4\cdot2^4 \)
(d) none of these
Show Answer & Explanation
Answer: (b) \( 16\cdot{}^8C_4 \)
Explanation:
1. Put x = 1: \( 3^n=6561=3^8 \), so n = 8.
2. Constant term: \( \binom8r2^rx^{2r-8} \) gives r = 4, i.e. \( \binom84\cdot2^4=16\cdot{}^8C_4 \).
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(a) 1
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(c) \( 2^{12} \)
(d) none of these
Show Answer & Explanation
Answer: (c) \( 2^{12} \)
Explanation:
1. Put x = y = 1: \( \left(1+\frac13+\frac23\right)^{12}=2^{12} \).
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61. .
(a) \( 2^{18} \)
(b) \( 2^{19} \)
(c) \( 2^{18}-{}^{19}C_{10} \)
(d) none of these
Show Answer & Explanation
Answer: (a) \( 2^{18} \)
Explanation:
1. There are 20 coefficients, symmetric about the middle, so the last ten equal the first ten.
2. Their sum is half of \( 2^{19} \), i.e. \( 2^{18} \).
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72. .
(a) \( 2^n \)
(b) \( 2^{n-1}-1 \)
(c) \( 2^n-1 \)
(d) \( 2^{n-1}+1 \)
Show Answer & Explanation
Answer: (b) \( 2^{n-1}-1 \)
Explanation:
1. Sum of even-indexed coefficients \( =2^{n-1} \), which includes the constant term 1 (r = 0).
2. Excluding it gives \( 2^{n-1}-1 \).
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81. .
(a) 1
(b) −1
(c) 0
(d) none of these
Show Answer & Explanation
Answer: (b) −1
Explanation:
1. Put x = 1: \( (1+1-3)^{2163}=(-1)^{2163}=-1 \).
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55. .
(a) \( 3^{40}+1 \)
(b) \( 3^{40}-1 \)
(c) \( \frac12(3^{40}-1) \)
(d) \( \frac12(3^{40}+1) \)
Show Answer & Explanation
Answer: (d) \( \frac12(3^{40}+1) \)
Explanation:
1. Integral powers of x come from even r in \( \binom{40}r(2\sqrt x)^r \).
2. Sum of even-r terms at x = 1: \( \frac{(1+2)^{40}+(1-2)^{40}}2=\frac{3^{40}+1}2 \).
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(a) \( 2^{20}+\frac{20!}{(10!)^2} \)
(b) \( 2^{19}-\frac12\cdot\frac{20!}{(10!)^2} \)
(c) \( 2^{19}+{}^{20}C_{10} \)
(d) none of these
Show Answer & Explanation
Answer: (d) none of these
Explanation:
1. By symmetry \( 2\sum_{r=0}^{9}\binom{20}r+\binom{20}{10}=2^{20} \).
2. So \( \sum_{r=0}^{10}\binom{20}r=2^{19}+\frac12\binom{20}{10} \), which is not any of (a), (b), (c).
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107. .
(a) \( {}^{21}C_{4} \)
(b) \( {}^{21}C_4+{}^{10}C_4 \)
(c) \( {}^{21}C_{17}-{}^{10}C_6 \)
(d) none of these
Show Answer & Explanation
Answer: (c) \( {}^{21}C_{17}-{}^{10}C_6 \)
Explanation:
1. Hockey-stick: \( \sum_{k=3}^{20}\binom k3=\binom{21}4 \) and the terms for k = 3 to 9 sum to \( \binom{10}4 \).
2. So the sum is \( \binom{21}4-\binom{10}4=\binom{21}{17}-\binom{10}6 \).
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49. .
(a) \( 3^{10} \)
(b) \( 2^{10} \)
(c) \( 2^9 \)
(d) none of these
Show Answer & Explanation
Answer: (b) \( 2^{10} \)
Explanation:
1. Put x = i: \( (1+i)^{10}=(a_0-a_2+\cdots)+i(a_1-a_3+\cdots) \).
2. The required sum is \( |1+i|^{20}=(\sqrt2)^{20}=2^{10} \).
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107. .
(a) \( \frac12 \)
(b) 0
(c) \( \frac12\cdot3^{10} \)
(d) none of these
Show Answer & Explanation
Answer: (a) \( \frac12 \)
Explanation:
1. For k ≥ 1 the term is \( (-1)^k2^{k-1}\binom{10}k \), so the bracket is \( 1+\frac12\left[(1-2)^{10}-1\right]=1 \).
2. Hence the sum is \( \frac12 \).
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103. .
(a) \( \frac{n(n+1)}4\cdot2^n \)
(b) \( 2^{n-1}-3 \)
(c) \( n\cdot2^{n-1} \)
(d) none of these
Show Answer & Explanation
Answer: (c) \( n\cdot2^{n-1} \)
Explanation:
1. Use \( r\binom nr=n\binom{n-1}{r-1} \).
2. Sum \( =n\cdot2^{n-1} \).
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69. .
(a) \( (n-1)a_n \)
(b) \( na_n \)
(c) \( \frac12na_n \)
(d) none of these
Show Answer & Explanation
Answer: (c) \( \frac12na_n \)
Explanation:
1. Replace r by n − r: \( S=\sum\frac{n-r}{{}^nC_{n-r}}=\sum\frac{n-r}{{}^nC_r} \).
2. Adding: \( 2S=n\sum\frac1{{}^nC_r}=na_n \).
3. So \( S=\frac12na_n \).
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61. .
(a) \( n\cdot2^{n-1}+a \)
(b) 0
(c) a
(d) none of these
Show Answer & Explanation
Answer: (c) a
Explanation:
1. Split: \( a\sum(-1)^{r-1}\binom nr-\sum(-1)^{r-1}r\binom nr \).
2. The first sum equals 1 (since \( \sum_{r=0}^n(-1)^r\binom nr=0 \)) and the second is \( n\sum(-1)^{r-1}\binom{n-1}{r-1}=0 \) for n ≥ 2.
3. So the total is a.
Teacher's Note:
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86. .
(a) \( \frac{(n+1)^{n+1}}{n!} \)
(b) \( \frac{(n+1)^n}{n!} \)
(c) \( \frac{n^{n-1}}{(n-1)!} \)
(d) \( \frac{(n+1)^{n-1}}{(n-1)!} \)
Show Answer & Explanation
Answer: (b) \( \frac{(n+1)^n}{n!} \)
Explanation:
1. \( \frac{a_k}{a_{k-1}}=\frac{n-k+1}k \), so \( 1+\frac{a_k}{a_{k-1}}=\frac{n+1}k \).
2. Product over k = 1..n is \( \frac{(n+1)^n}{n!} \).
Teacher's Note:
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86. .
(a) 5(2n − 9) with n = 10, i.e. 55
(b) 100
(c) 90
(d) none of these
Show Answer & Explanation
Answer: (a) 5(2n − 9) with n = 10, i.e. 55
Explanation:
1. \( \frac{{}^{10}C_r}{{}^{10}C_{r-1}}=\frac{11-r}{r} \), so each term is 11 − r.
2. Sum for r = 1..10 is 10 + 9 + ... + 1 = 55.
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86. .
(a) \( n\cdot2^{2n-1} \)
(b) \( 2^{2n-1} \)
(c) \( 2^{n-1}+1 \)
(d) none of these
Show Answer & Explanation
Answer: (a) \( n\cdot2^{2n-1} \)
Explanation:
1. \( r\binom{2n}r=2n\binom{2n-1}{r-1} \).
2. Sum \( 2n\sum_{j=0}^{n-1}\binom{2n-1}j=2n\cdot2^{2n-2}=n\cdot2^{2n-1} \) (half of the row sum).
Teacher's Note:
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87. .
(a) \( 2^{19} \)
(b) 0
(c) \( 2^{20}-1 \)
(d) none of these
Show Answer & Explanation
Answer: (b) 0
Explanation:
1. \( \sum(-1)^{r-1}r\binom{20}r=20\sum(-1)^{r-1}\binom{19}{r-1}=20(1-1)^{19}=0 \).
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