Find a if the `17^th` and `18^th` terms of the expansin `(2 + a)^50`are equal.

If the coefficients of r^(th) and (r+1)^(th) terms in the expansion of (3+7 x)^(29) are equal, the r is equal to

If the coefficients of (r-5)^(th) and (2r - 1)^(th) terms in the expansion of (1 + x)^34 are equal, find r.

If the coefficients of r^(th) and (r+1)^(th) term in the expansion of (1+x)^(n) are equal then n=

The coefficients of (2 r+4)^(th) and (r-2)^(th) terms in the expansion of (1+x)^(18) are equal. Then the value of r=

Find the 4^(th) term in the expansion of (x-2y)^12 .

Find the 9^(th)andn^(th) term of the G.P.3,6,12,24……

If r^(th) and (r+1)^(th) term in the expansion of (1+x)^(n) are equal, then n =

Find the 5th and nth term of sequence -2,-6,-18,"…."

If the coefficient of the r^(th) term and the (r+1)^ (th) term is the expansion of (1+x)^(20) are in the ratio 1: 2 then r =

Find the 10^(th) and n^(th) terms of the G.P . 5, 25,125 ...............