If the third and the 9^th terms of an A.P. be 4 and -8 respectively, find which term is zero?

An A.P. consists of 50 terms of which 3^rd term is 12 and the last term is 106. Find the 29^th term of the A.P.

How many terms of the series 18 + 15 + 12 + ……. when added together will give 45?

Find the general term (n^th term) and 23^rd term of the sequence, 3, 1, -1, -3, ………