The first term of an A.P. is 2 and the last term is 50. The sum of all these terms is 442. Find the common difference.

The first and the last terms of an A.P. are 17 and 350 respectively. If the common difference is 9, how many terms are there and what is their sum?

The third term of an A.P. is 7 and the seventh term exceeds three times the third term by 2. Find the first term, the common difference and the sum of first 20 terms.

If 12^th term of an A.P. is 13 and the sum of the first four terms is 24, what is the sum of first 10 terms?

Find the sum of first 22 terms of an A.P. in which d = 22 and a₂₂ = 149.