Published by:
CGP EDU Academic Team
Published on: August 14, 2026
If the coefficients of x and x 2 in the expansion of (1 + x) p (1- x) q , p, q 
15, are -3 and-5 respectively, then the coefficient of x 3 is equal to______________.
Text Solution
Verified by ExpertsThe correct answer is:
23
(23)
Since coefficient of x is -3
….(1)
Comparing coefficients of x 2
- p C 1 q C 1 + p C 2 + q C 2 =-5
…(2)
Solving (1) and (2)
p=8, q= 11 Coefficient of x 3 is
=23
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