If ^ 20 C_r is the co-efficient of x^r in the expansion of (1+x)^ 20 , the value of _ r=0 ^ 20 r^2 ,^ 20 C_r...

Question

If ^ 20 C_r is the co-efficient of x^r in the expansion of (1+x)^ 20 , the value of _ r=0 ^ 20 r^2 ,^ 20 C_r is equal to

Accepted Answer

(A)

JEE Main 2021 Mathematics question