The first three terms of an A.P. respectively are 3y – 1, 3y + 5 and 5y + 1. Then, y equals

If 7th and 13th terms of an A.P. be 34 and 64 respectively, then its 18th term is

If the sum of it terms of an A.P. is 2n2 + 5n, then its nth term is

If the sum of first n even natural number is equal to k times the sum of first n odd natural numbers, then k =

In an AP, Sp = q, Sq = p and S denotes the sum of first r terms. Then, Sp+q is equal to

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