The first three terms in the expansion of `(1+ax)^(n)(n ne 0)` are
1,6x, and `16x^(2)`. Then find the value of a and n.

Write the first three terms in the expansion of (1+ax)^n,ninN

If the first three terms in the expansion of (1+ax)^n are 1,6x and 16x^2 , find a and n

Find the general term in the expansion of (x+y)^n

The first three terms in the expansion of (1+a x)^n are 1,12 x,64 x^2 . Find n and a.

If the first three terms in the expansion of (1+ax)^n are 1,-21x and 216x^2 respectively, prove that a=-3/7 and n=49.

The number of term in the expansion of (x-1/x)^2n is…….

If the coefficients of three consecutive terms in the expansion of (1+x)^(n) are in the ratio 1:7:42, then find the value of n.

The first term in the expansion of (1+ax)^n in ascending powers of x are 1+12x+64x^2, find n and a.