Multiple Choice Questions (MCQs) for JEE Mathematics: Binomial Theorem for Positive Integral Index
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Practice Binomial Theorem for Positive Integral Index MCQs for JEE Mathematics
View or download the dedicated Binomial Theorem for Positive Integral Index MCQ resource below. Practicing these 50 objective questions regularly builds familiarity with standard exam patterns and helps secure higher marks in final Mathematics evaluations.
Multiple Choice Questions
(a) 18
(b) 9
(c) 19
(d) 24
Show Answer & Explanation
Answer: (c) 19
Explanation:
1. Since \( 1+3x+3x^2+x^3=(1+x)^3 \), the expression equals \( (1+x)^{18} \).
2. It has 18 + 1 = 19 terms.
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100. .
(a) 136
(b) 153
(c) 16
(d) 17
Show Answer & Explanation
Answer: (b) 153
Explanation:
1. Distinct terms correspond to non-negative solutions of a + b + c = 16.
2. Their number is \( \binom{18}{2}=153 \).
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(a) 97
(b) 98
(c) 96
(d) 99
Show Answer & Explanation
Answer: (a) 97
Explanation:
1. General term \( \binom{100}{r}5^{r/8}2^{(100-r)/6} \) is rational only if 8 divides r and 6 divides 100 − r.
2. r = 16, 40, 64, 88 give 4 rational terms out of 101.
3. Irrational terms = 101 − 4 = 97.
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(a) 2n + 1
(b) 2n
(c) n
(d) none of these
Show Answer & Explanation
Answer: (b) 2n
Explanation:
1. The expression equals \( \left(x-\frac1x\right)^{2n} \), which has 2n + 1 terms.
2. Exactly one of them (the middle term) is independent of x, so 2n terms depend on x.
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(a) n
(b) n + 1
(c) n − 1
(d) 2n
Show Answer & Explanation
Answer: (a) n
Explanation:
1. Term \( \binom{4n-2}{k}i^kx^k \) is real and negative when \( i^k=-1 \), i.e. k = 2, 6, 10, ..., 4n − 2.
2. That gives n values of k.
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113. .
(a) 7
(b) 14
(c) 6
(d) 4
Show Answer & Explanation
Answer: (d) 4
Explanation:
1. Odd powers of the root cancel, leaving \( 2[x^6+15x^4(x^2-1)+15x^2(x^2-1)^2+(x^2-1)^3] \).
2. It simplifies to \( 64x^6-96x^4+36x^2-2 \).
3. This has 4 terms.
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101. .
(a) 2n
(b) 3n
(c) 2n + 1
(d) 3n + 1
Show Answer & Explanation
Answer: (c) 2n + 1
Explanation:
1. The lowest power of x is \( x^{-2n} \) and the highest is \( x^{2n} \), and every power in between that differs by 2 occurs.
2. The exponents are −2n, −2n + 2, ..., 2n, giving 2n + 1 distinct values.
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102. .
(a) 6
(b) 7
(c) 5
(d) 8
Show Answer & Explanation
Answer: (b) 7
Explanation:
1. A general term is \( \frac{6!}{a!b!c!}(\sqrt2)^b(\sqrt[3]3)^c \) with a + b + c = 6.
2. It is rational when b is even and c is a multiple of 3.
3. Valid (b, c): (0,0),(2,0),(4,0),(6,0),(0,3),(2,3),(0,6) so 7 terms.
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99. .
(a) 100
(b) 50
(c) 101
(d) none of these
Show Answer & Explanation
Answer: (c) 101
Explanation:
1. The general term is \( \binom{600}{r}7^{(600-r)/3}5^{r/2}x^r \).
2. The coefficient is an integer if 3 divides 600 − r and 2 divides r, i.e. r is a multiple of 6.
3. r = 0, 6, ..., 600 gives 101 terms.
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89. .
(a) \( p=\frac52,\ m=3 \)
(b) \( p=\frac12,\ m=6 \)
(c) \( p=-\frac12,\ m=6 \)
(d) none of these
Show Answer & Explanation
Answer: (b) \( p=\frac12,\ m=6 \)
Explanation:
1. The 4th term is \( \binom m3p^{m-3}x^{m-6} \). It is independent of x only if m = 6.
2. Then \( 20p^3=\frac52 \), so \( p^3=\frac18 \) and \( p=\frac12 \).
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93. .
(a) a = 2, n = 4
(b) a = 4, n = 2
(c) a = 2, n = 6
(d) a = −2, n = 4
Show Answer & Explanation
Answer: (a) a = 2, n = 4
Explanation:
1. na = 8 and \( \binom n2a^2=24 \).
2. Dividing: \( \frac{(n-1)a}{2}=3 \), so (n − 1)a = 6.
3. Subtracting from na = 8 gives a = 2, hence n = 4.
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(a) 25
(b) 20
(c) 15
(d) none of these
Show Answer & Explanation
Answer: (c) 15
Explanation:
1. General term \( \binom nr(-1)^rx^{3n-5r} \).
2. For x⁵: 5r = 3n − 5; for x¹⁰: 5r = 3n − 10. With n = 15, r = 8 and r = 7 respectively.
3. Coefficients are \( \binom{15}{8}(-1)^8+\binom{15}{7}(-1)^7=0 \) since \( \binom{15}8=\binom{15}7 \).
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131. .
(a) \( {}^{30}C_{10} \)
(b) \( {}^{30}C_{25} \)
(c) 1
(d) none of these
Show Answer & Explanation
Answer: (b) \( {}^{30}C_{25} \)
Explanation:
1. Since \( x^2+2+\frac1{x^2}=\frac{(1+x^2)^2}{x^2} \), the expression becomes \( x^{10}(1+x^2)^{30} \).
2. We need the coefficient of \( x^{10} \) in \( (1+x^2)^{30} \), i.e. of \( (x^2)^5 \).
3. It is \( \binom{30}{5}=\binom{30}{25} \).
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93. .
(a) \( {}^{18}C_{8} \)
(b) \( {}^{18}P_{10} \)
(c) \( 2^{18} \)
(d) none of these
Show Answer & Explanation
Answer: (a) \( {}^{18}C_{8} \)
Explanation:
1. The term containing \( a^8b^{10} \) is \( \binom{18}{8}a^8b^{10} \).
2. So the coefficient is \( {}^{18}C_8 \).
Teacher's Note:
1. T
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4.
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27. n
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(a) 10
(b) 8
(c) 9
(d) none of these
Show Answer & Explanation
Answer: (c) 9
Explanation:
1. Coefficients are \( \binom{20}{m} \) and \( \binom{20}{m+2} \).
2. Equality needs m + (m + 2) = 20, so m = 9.
Teacher's Note:
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54. .
(a) 10
(b) −20
(c) −50
(d) −30
Show Answer & Explanation
Answer: (d) −30
Explanation:
1. Write \( (1-x+x^2)^5 \) and collect x³ from products: terms \( x^3 \) from three x's (one sign each) and from one x with one x².
2. Three factors give \( (-x)^3 \): \( \binom53(-1)^3=-10 \).
3. One x² and one (−x): \( \frac{5!}{1!\,1!\,3!}(x^2)(-x)=-20 \).
4. Total = −30.
Teacher's Note:
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106. .
(a) 7
(b) 14
(c) 2
(d) none of these
Show Answer & Explanation
Answer: (a) 7
Explanation:
1. \( 2\binom n2=\binom n1+\binom n3 \).
2. This gives \( n(n-1)=n+\frac{n(n-1)(n-2)}6 \) and simplifies to \( n^2-9n+14=0 \).
3. So n = 2 or 7; n ≥ 3 is needed for a 4th term, hence n = 7.
Teacher's Note:
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110. .
(a) \( {}^{16}C_{9} \)
(b) \( {}^{16}C_5-{}^6C_5 \)
(c) \( {}^{16}C_6-1 \)
(d) none of these
Show Answer & Explanation
Answer: (a) \( {}^{16}C_{9} \)
Explanation:
1. Coefficient is \( \binom66+\binom76+\cdots+\binom{15}6 \).
2. By the hockey-stick identity this is \( \binom{16}7=\binom{16}9 \).
Teacher's Note:
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124. .
(a) \( 2\cdot{}^9C_7\cdot{}^7C_4 \)
(b) \( -2\cdot{}^9C_2\cdot{}^7C_3 \)
(c) \( {}^9C_7\cdot{}^7C_4 \)
(d) none of these
Show Answer & Explanation
Answer: (b) \( -2\cdot{}^9C_2\cdot{}^7C_3 \)
Explanation:
1. Multinomial coefficient \( \frac{9!}{1!\,3!\,4!\,1!} \) for the exponents 1, 3, 4, 1 and the sign of \( (-z) \) gives a factor −1.
2. Value \( -2520=-2\times36\times35=-2\cdot{}^9C_2\cdot{}^7C_3 \).
Teacher's Note:
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76. .
(a) 4
(b) −4
(c) 0
(d) none of these
Show Answer & Explanation
Answer: (a) 4
Explanation:
1. Since \( 1+x+x^2+x^3=\frac{1-x^4}{1-x} \), the product is \( (1-x)(1-x^4)^4 \).
2. Expand: \( (1-x)(1-4x^4+6x^8-4x^{12}+x^{16}) \).
3. x¹³ arises from \( -x\cdot(-4x^{12})=4x^{13} \).
Teacher's Note:
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88. .
(a) \( {}^{12}C_{6} \)
(b) \( -{}^{12}C_5 \)
(c) 0
(d) none of these
Show Answer & Explanation
Answer: (c) 0
Explanation:
1. General term \( \binom{12}r(-1)^rx^{24-3r}y^{2r-12} \).
2. x⁶ requires r = 6, which makes the power of y equal to 0, not −2.
3. So no such term exists: the coefficient is 0.
Teacher's Note:
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