In an A.P. of 99 terms the sum of all the odd- numbered terms is 2550 . Then find the sum of all the 99 terms of the A.P.

If the sum of 12 th and 22nd terms of an AP is 100 then the sum of the first 33 terms of the AP is

Find the sum to 20 terms of the AP 10,7,4,……

Find the sum to 15 terms of the AP 3,7,11,……

In an A.P. of which a is the first term if the sum of the first p terms is zero then the sum of the next q terms is

In an AP, the first term is 2 and the sum of the first five terms is one fourth the sum of the next five terms. Find the 20^th term.

In an AP, the first term is 2 and the sum of the first five terms is one fourth the sum of the next five terms. Find the common dfference.

In an AP, the first term is 2 and the sum of first five terms is 5. Then the 31st term is

Consider the A.P. 18,15,12.... Find the sum to n terms of the A.P.

An AP consists of 23 terms. If the sum of the three terms in the middle is 141 and the sum of the last three terms is 261, then the first term is

if the sum of 12^th and 22^th terms of an AP is 100. Find the sum of first 33 terms.