The ratio of the `rth` term and the `(r+1)th` term in the expansion of `(1+x)^n `is

If the coefficients of the r^(th) term and the (r + 1)^(th) term in the expansion of (1 + x)^(20) are in the ratio 1:2 , then r is equal to

n th term in the expansion of (x+(1)/(x))^(2n)

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 =

(r+1)^(th) term in the expansion of (1-x)^(-4) will be

Find the (r+1) th term in the expansion of ((x)/(a)-(a)/(x))^(2n)

Find the (r+1) th term in the expansion of ((x)/(a)-(a)/(x))^(2n)

Find the (r+1) th term in the expansion of ((x)/(a)-(a)/(x))^(2n)

Given positive integers r>1,n> 2, n being even and the coefficient of (3r)th term and (r+ 2)th term in the expansion of (1 +x)^(2n) are equal; find r