If the sum of m terms of an A.P. is same as the sum of its n terms, then the sum of its (m+n) terms is

If the sum of p terms of an A.P is equal to sum of q terms (p != q) then the sum of (p + q) terms is

If the sum of first p terms of an A.P. is equal to the sum of the first q terms, then find the sum of the first (p + q) terms.

Sum of n-terms of a G.P. is ___.

The first term of an A.P. is a and the sum of first p terms is zero, show tht the sum of its next q terms is (a(p+q)q)/(p-1)dot

If the sum of first 7 terms of an AP is 49 and that of 17 terms is 289, find the sum of first n terms.

The pth term of an A.P. is a and qth term is bdot Then find the sum of its (p+q) terms.

If sum of m terms is n and sum of n terms is m, then show that the sum of (m + n) terms is -(m + n).

If the sum of n terms of an A.P is cn (n-1)where c ne 0 then the sum of the squares of these terms is

If the 7^(th) term of n A.P is 40. Then the sum of its first 13 terms is

If the sum of the first ten terms of an A.P is four times the sum of its first five terms, the ratio of the first term to the common difference is: