JEE Mathematics Binomial Theorem for Positive Integral Index MCQs Set 03

Multiple Choice Questions (MCQs) for JEE Mathematics: Binomial Theorem for Positive Integral Index

Access targeted multiple-choice questions for Binomial Theorem for Positive Integral Index designed to align with the latest JEE academic syllabus for JEE Mathematics. These objective practice sets help students evaluate their conceptual understanding and improve exam readiness.

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

Question 1: The number of terms in the expansion of \( (1+3x+3x^2+x^3)^6 \) is
(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. .

Question 2: The number of distinct terms in the expansion of \( (x+y-z)^{16} \) is
(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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Question 3: The number of irrational terms in the expansion of \( (5^{1/8}+2^{1/6})^{100} \) is
(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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Question 4: The number of terms whose values depend on x in the expansion of \( \left(x^2-2+\frac1{x^2}\right)^n \) is
(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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Question 5: The number of real negative terms in the expansion of \( (1+ix)^{4n-2} \), n ∈ N, x > 0, is
(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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Question 6: The number of terms in the expansion of \( \left(x+\sqrt{x^2-1}\right)^6+\left(x-\sqrt{x^2-1}\right)^6 \) is
(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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Question 7: The number of terms in the expansion of \( \left(x^2+1+\frac1{x^2}\right)^n \), n ∈ N, is
(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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Question 8: The number of rational terms in the expansion of \( (1+\sqrt2+\sqrt[3]{3})^6 \) is
(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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Question 9: The number of terms with integral coefficients in the expansion of \( (7^{1/3}+5^{1/2}x)^{600} \) is
(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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Question 10: If the 4th term in the expansion of \( (px+x^{-1})^m \) is 2.5 for all x ∈ R, then
(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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Question 11: In the expansion of \( (1+ax)^n \), n ∈ N, the coefficients of x and x² are 8 and 24 respectively. Then
(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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Question 12: In the expansion of \( \left(x^3-\frac1{x^2}\right)^n \), n ∈ N, if the sum of the coefficients of x⁵ and x¹⁰ is 0, then n is
(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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Question 13: The coefficient of \( x^{20} \) in the expansion of \( (1+x^2)^{40}\left(x^2+2+\frac1{x^2}\right)^{-5} \) is
(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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Question 14: The coefficient of \( a^8b^{10} \) in the expansion of \( (a+b)^{18} \) is
(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:
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Question 15: If the coefficients of the (m + 1)th and (m + 3)th terms in the expansion of \( (1+x)^{20} \) are equal, then m is
(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. .

Question 16: The coefficient of \( x^3 \) in the expansion of \( (1-x+x^2)^5 \) is
(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.

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Question 17: If the coefficients of the 2nd, 3rd and 4th terms in the expansion of \( (1+x)^n \), n ∈ N, are in AP, then n is
(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.

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Question 18: The coefficient of \( x^6 \) in \( \{(1+x)^6+(1+x)^7+\cdots+(1+x)^{15}\} \) is
(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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Question 19: The coefficient of \( x^3y^4z \) in the expansion of \( (1+x+y-z)^9 \) is
(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 \( -2520=-2\times36\times35=-2\cdot{}^9C_2\cdot{}^7C_3 \).

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Question 20: The coefficient of \( x^{13} \) in the expansion of \( (1-x)^5(1+x+x^2+x^3)^4 \) is
(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 \( -x\cdot(-4x^{12})=4x^{13} \).

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88. .

Question 21: The coefficient of \( x^6y^{-2} \) in the expansion of \( \left(\frac{x^2}{y}-\frac yx\right)^{12} \) is
(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.

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