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CGP EDU Academic Team
Published on: August 14, 2026
The coefficient of x 4 in the expansion of (l + x + x 2 ) is
Text Solution
Verified by ExpertsThe correct answer is:
B
90
(1 + x (1 + x)) 6 = 1 + 6 C 1 x (1 + x) + 6 C 2 x 2 (l + x) 2 + 6 C 3 x 3 (l + x) 3 + 6 C 4 x 4 (l + x) 4 +.. .
Coefficient of x 4 is
6 C 2 + 6 C 3 .3+ 6 C 4
15 + 60+15
= 90
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