Find `a` if the 7th and 18th terms of the expansion `(2+a)^(50)` are equal.

Find a if 17th and 18th terms in the expansion of (2+a)^(50) are equal.

Find a if 17th and 18th terms in the expansion of (2+a)^(50) are equal.

Find a if 17th and 18th terms in the expansion of (2+a)^(50) are equal.

If 17^(th) and 18^(th) terms in the expension of (2+a)^(50) are equal ,then the value of a is :

Find the 10th term in the expansion of 5^x

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

If the coefficient of (2r+4)th and (r-2)th terms in the expansion of (1+x)^(18) are equal, find r .

The coefficients of (2r +1) th and (r+2) th terms in the expansions of (1 +x)^(43) are equal. Find the value of r .

Given positive integers r>1,n> 2, n being even and the coefficient of (3r)th term and (r+ 2)th term in the expansion of (1 +x)^(2n) are equal; find r

If the coefficients of (2r + 1)th term and (r + 2)th term in the expansion of (1 + x)^(48) are equal,find r .