In the expansion of `(3-x)/((1-x)^2` coefficient of `x^r` is 9 then r =

If in the expansion of (1-x)^(2n-1) , the coefficient of x^r is denoted by a_r then a_(r-1)+a_(2n-r)=

In the binomial expansion of (1+x)^15 the coefficient of x^r and x^(r+3) are equal, then r =

In the binomial expansion of (1+x)^(15) , the coefficients of x^(r ) and x^(r+3) are equal. Then r is

In the expansion of (1-x)^(30)(1+x+x^(2))^(31) the coefficient of x^(47) is (-^(30)C_(r)) then the value of |(r)/(2)| is

Consider the expansion of (1 + x)^(2n+1) If the coefficients of x^(r) and x^(r+1) are equal in the expansion, then r is equal to

If in the expansion of (1+x)^43 the coefficient of (2r+1)^(th) term in equal to the coefficient of (r+2)^(th) term find r.