If the coefficient of rth term and `(r+1)th` term in the expansion of `(1+x)^20` are in the ration `1:2`, then `r=`

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

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

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

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 =

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

If the coefficients of (2r+1)th term and (4r+5)th term in the expansion of (1+x)^10 are equal then r=

The numbet of values of r for which the coefficients of rth and (r + 1)th terms in the expansion of (1 + x)^(3n) are in the ratio 1 :2, is __ _

If the coefficients of (2r+1)th term and (r+2)th term in the expansion of (1+x)^(48) are equal,find r.