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

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 sum of coefficient of first half terms in the expansion of (x+y)^(n) is 256, then find the greatest coefficient in the expansion.

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

The coefficient of middle term in the expansion of (1+x)^(n) when n is even,is

Suppose the coefficient of the middle term in the expansion of (1 + x)^(2n) is A and the coefficients of two middle terms in the expansion of (1 + x)^(2n-1) are B and C, then A/(B+C)= _________

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

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=_________

If the coefficient of (r +1)^(th) term in the expansion of (1 +x)^(2n) be equal to that of (r + 3)^(th) term , then