The first of an A.P is 5, the last term is 45 and the sum is 400. Find the number of terms and the common difference.

The sum of the first 8 terms of an A.P. is 100 and the sum of its first 19 terms is 551. Find the first term and the common difference of the AP.

The third term of an AP is 7 and the 7^(th) term exceeds 3 times the third term by 2. Find the first term and the common difference and the sum of first 20 terms.

If the sum of first 10 terms of an A.P. is 4 times the sum of its first 5 terms, then find the ratio of first term and common difference.

The first term of a GP is 1. The sum of 3rd and 5th term is 90. Find the common ratio of the G.P.

The first term of an A.P is 2 and last term is 59. Find the common difference if sum of all terms is 610 .

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

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

The first term of a G. P. is 1 . The sum of the third and fifth terms is 90 . Find the common ratio of G.P.

The sum of first 14 terms of an AP is 1505 and its first term is 10. Find its tenth term.

If the sum of first 8 terms of an Arithmetic progression is 136 and that of first 15 terms is 465, then find the sum of first 25 terms. OR Ths sum of the 5th and 9th terms of an A.P. is 40 and the sum of the 8th and 14th term is 64. Find the sum of the first 20 terms.