Published by:
CGP EDU Academic Team
Published on: August 13, 2026
Prove that coeff. of x 20 in (1 + x 2 ) 40 . 
is 30 C 5
Text Solution
Verified by ExpertsThe correct answer is:
1
Sol. (1 + x 2 ) 40 . 
= (1 + x 2 ) 40 . 
= 
coeff of x 20 in 
= coeff of x 20 in x 10 (1 + x 2 ) 30 = coeff of x
10 in (1 + x 2 ) 30 =
30 C 5
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