Find the coefficient of the last term `(a-b)^(5).`

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

If in the expansion of (1+x)^n the coefficient of three consecutive terms are 56,70 and 56, then find n and the position of the terms of these coefficients.

Find the coefficient of a^5b^7""in""(a-2b)^(12)

Find the coefficient of a^5b^7in(a-2b)^(12)

Find the coefficient of a^5b^7in(a-2b)^(12)

In the expansion of (x^(2) + (1)/(x) )^(n) , the coefficient of the fourth term is equal to the coefficient of the ninth term. Find n and the sixth term of the expansion.

Find the coefficient of one middle term in the expansio of (1+x)^(2n) .

If the coefficient of the 5^(th) term be the numerically the greatest coefficient in the expansion of (1-x)^n , then the positiveintegral value of n is

If the coefficient of (2r+ 5) th term and (r- 6) th term in the expansion (1+x)^39 are equal, find r

Sum of coefficients of expansion of B is 6561 . The difference of the coefficient of third to the second term in the expansion of A is equal to 117 . The ratio of the coefficient of second term from the beginning and the end in the expansion of B , is