Question

If the coefficients of x7 & x8 in the expansion of [2+x/3]n are equal, then the value of n is:

(A) 15

(B) 45

(C) 55

(D) 56

Answer 1

Correct Option (C) 55

Explanation:

In the expansion (2+x/3)n the coefficients of x7 & x8 are equal.