If the coefficients of `x^(9),x^(10),x^(11)` in expansion of `(1+x)^(n)` are in A.P., the prove that `n^(2)-41n+398=0`.

If the coefficients of x^9, x^10, x^11 in the expansion of (1+x)^n are in arithmetic progression then n^2=41n=

If the coefficients of x, x^2 and x^3 in the binomial expansion of (1+x)^(2n) are in A.P., prove that 2n^2-9n+7=0 .

If the coefficients of 5^(th), 6^(th) and 7^(th) terms in the expansion of (1+x)^(n) are in A.P. then n =

If the coefficients of 2nd, 3rd and 4th terms in the expansion of (1+x)^(2n) are in A.p., then prove that 2n^2-9n+7=0 .

If the coefficients of 2^(nd),3^(rd) and 4^( th ) terms in expansion of (1+x)^(n) are in A.P then value of n is

If the coefficients of 2^(nd), 3^(rd) and 4^(th) terms in expansion of (1+x)^n are in A.P then value of n is

If the coefficient of the rth, (r+1)th and (r+2)th terms in the expansion of (1+x)^(n) are in A.P., prove that n^(2) - n(4r +1) + 4r^(2) - 2=0 .

If the coefficient of the rth, (r+1)th and (r+2)th terms in the expansion of (1+x)^(n) are in A.P., prove that n^(2) - n(4r +1) + 4r^(2) - 2=0 .

If the coefficient of pth,(p+1)thand(p+2)th terms in the expansion of (1+x)^(n) are in A.P