The sum of the first 4 terms of an A.P. is 56. The sum of the last 4 terms is 112. If its first term is 11, then find the number of terms.

The sum of the first four terms of an A.Pis 56. The sum of the last four terms is 112. If its first term is 11, then find the number of terms.

If the sum of the first 100 terms of an AP is -1 and the sum of even terms lying in first 100 terms is 1, then which of the following is not true?

If the sum of first 75 terms of an AP is 2625, then the 38th term of the AP is

The first term of a G.P. is 1. The sum of the third term and fifth term is 90. Find the C.R of the G.P

The sum of first three terms of a G.P. is 16 and the sum of the next three terms is 128. Determine the first term, the common ratio and the sum to n terms of the G.P.

The sum of the first three terms of a G. P is 16 and the sủm of the next three terms is 128. Determine the first term, common ratio and 'the sum to n térms of the G. P

If the first term of a GP is 729 and 7th term is 64, then the sum of its first seven terms is

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

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

Write the first three terms of each of the arithmetic sequences described below: i) First term 30, the sum of the first three terms is 300 ii) First term 30, the sum of the first.four terms is 300 iii) First term 30 , the sum of the, first five terms is 300 iv) First term 30 , the sum of the first six terms is 300