If some three coefficients in the binomial expansion of (x + 1)^n in powers of x are in the ratio 2 : 15 :...

Question

If some three coefficients in the binomial expansion of (x + 1)^n in powers of x are in the ratio 2 : 15 : 70, then the average of these three coefficients is:

Accepted Answer

(A)

JEE Main 2019 Mathematics question

Solution