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An AP 5, 12, 19, .... has 50 term. Find its last term. Hence, find the sum of its last 15 terms.

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An AP 5, 12, 19, .... has 50 term. Find its last term. Hence, find the sum of its last 15 terms.

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The given AP is 5,12,19,....... 

Here, a = 5, d = 12-5 = 7 and n = 50

Since there are 50 terms in the AP, so the last term of the AP is a50.

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