If the coefficient of 4th term in the expansion of `(a+b)^n` is 56, then n is

If the coefficient of pth term in the expansion of (1+x)^n is p and the coefficient of (p+1)th term is q then n=

If the coefficient of p^(th) term in the expansion of (1+x)^(n) is p and the coefficient of (p+1)^(th) term is q then n=

If the coefficient of 4^(th) term in the expansion of (x+(alpha)/(2 x))^(n) is 20, then the respective values ofalpha and n are

Find n if the coefficients of 4th the 13th terms in the expansion of (a+b)^n are equal.

Find n if the coefficients of 4th the 13th terms in the expansion of (a+b)^n are equal.

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

If the coefficient of (p + 1) th term in the expansion of (1+ x)^(2n) be equal to that of the (p +3) th term, show that p=n-1

If the coefficients of 4^(th) and 13^(th) terms in the expansion of (a+b)^(n) are equal then find n .

If a:b = 3:5, and sum of the coefficients of 5^(th) and 6^(th) terms in the expansion of (a-b)^(n) is zero, then n=_________