Find the sum : 2 + 7 + 12 + 17 + ..... to 19 terms.

Question

KnowledgeBoat · Accepted Answer

The above sequence is an A.P. with common difference = 12 - 7 = 5. We know that, Sum of n terms of an A.P. is given by, ∴ Sn = [2a + (n - 1)d] ⇒ S19 = [2(2) + (19 - 1)5] = 9.5 [4 + (18)5] = 9.5 [4 + 90] = 9.5 (94) = 893. Hence, S19 = 893.

Mathematics

Find the sum :
2 + 7 + 12 + 17 + ….. to 19 terms.

AP

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