There are 15 APs whose common differences are 1, 2, 3,…..15 respecti

1.	There are 15 APs whose common differences are 1, 2, 3,…..15 respectively, the first term of each being 1. Then sum of their 15th terms is (1) 1695 (2) 1792 (3) 1800 (4) 1924
Answer» (1) 1695 15^th term of these AP’s will form an AP in which first term = 15, common difference = 14 so, s₁₅= 15/2 [30 + 196] = 1695

There are 15 APs whose common differences are 1, 2, 3,…..15 respectively, the first term of each being 1. Then sum of their 15th terms is (1) 1695 (2) 1792 (3) 1800 (4) 1924

Answer»

(1) 1695

15^th term of these AP’s will form an AP in which first term = 15, common difference = 14

so, s₁₅= 15/2 [30 + 196] = 1695

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There are 15 APs whose common differences are 1, 2, 3,…..15 respectively, the first term of each being 1. Then sum of their 15th terms is (1) 1695 (2) 1792 (3) 1800 (4) 1924

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