The sum of the 4^th term and the 8^th term of an A.P. is 24 and the sum of the 6^th and 10^th term is 44. Find the first three terms of the A.P.

The sum of first 14 terms of an A.P. is 1050 and its 14^th term is 140. Find the 20^th term.

For an A.P., show that :

(m + n)^th term + (m - n)^th term = 2 × m^th term.

If the n^th term of the A.P. 58, 60, 62, …… is equal to the n^th term of the A.P. -2, 5, 12, ……., find the value of n.