How many numbers of two digit are divisible by 3?

The 4^th term of an A.P. is three times the first and the 7^th term exceeds twice the third term by 1. Find the first term and the common difference.

Find the second term and n^th term of an A.P. whose 6^th term is 12 and the 8^th term is 22.

An A.P. consists of 60 terms. If the first and the last terms be 7 and 125 respectively, find 32^nd term.

The sum of 4^th and 8^th terms of an A.P. is 24 and the sum of the 6^th and 10^th terms is 34. Find the first term and the common difference of the A.P.?