Published by:
CGP EDU Academic Team
Published on: August 14, 2026
The coefficient of x 4 in the expansion of (1 + x + x 2 + x 3 ) 11 is
Text Solution
Verified by ExpertsThe correct answer is:
A
(1 + x + x 2 + x 3 ) 11 = (1 + x) 11 (1+ x 2 ) 11
= (1 + 11 C 1 x + 11 C 2 x 2 + ...) (1+ 11 C 1 x 2 + 11 C 2 x 4 +....)
Coefficient of x 4 = 11 C 2 . 11 C 1 + 11 C 4 + 11 C 2
= 605 + 330 + 55
= 990
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