1.

If the coefficients of a^r-1, a^r and a^r+1 in the expansion of (1+a)^n are in arithmetic progression, prove that n^2 - n(4r+1)+4r^2 - 2 =0.

Answer»


ANSWER :`n^2 - n (4R + 1) + 4r^2 - 2 = 0`


Discussion

No Comment Found