Which term of A.P. 72, 68, 64, 60, ...., is 0 ?

Question

KnowledgeBoat · Accepted Answer

In the A.P. 72, 68, 64, 60,...., a = 72 and d = 68 - 72 = -4. Let nth term be 0. ∴ an = 0 nth term of an A.P. is given by, an = a + (n - 1)d ⇒ 0 = 72 + (n - 1)(-4) ⇒ -72 = (n - 1)(-4) ⇒ n - 1 = ⇒ n - 1 = 18 ⇒ n = 18 + 1 ⇒ n = 19. Hence, 19th term of A.P. is 0.

Mathematics

Which term of A.P. 72, 68, 64, 60, …., is 0 ?

AP

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