For an A.P ,the sum of it's terms is 60, common difference is 2 and the last term is 18 .Find the number of terms in the A.P.
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Answer. The number of terms = 4 for a = 12 , number of terms = 15 , for a = -10. Given the sum of an A.P is 60 , d(common difference)= 2, last term = 18.
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