If in the expansion of `(a+b)^n` the coefficient of `4^(th)` and `13^(th)` term are equal. Find the value of `n`

If in the expansion of (1 + x)^(20) , the coefficients of r^(th) and (r +4)^(th) terms are equal, then the value of r,is

In the binomial expansion of (a+b)^(n) , the coefficients of the 4^(th)and13^(th) terms are equal to each other, find n.

In the expansion of (X+y)^(n) , the coefficients of the 17th and the 13th terms equal. Find the numbher of term in the expansion

In the expansion of (1+x)^(n) if the coefficients of the terms 5^(th) and 19^(th) are equal then n = ………..

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

If in the binomial expansion of (1+x)^(n) ,the coefficient of 14th,15th and 16th terms are in A.P.,then find n.