How many terms are there in AP 7, 11, 15, …., 139? – InterviewSolution

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1.	How many terms are there in AP 7, 11, 15, …., 139?
Answer» In the given AP, we have a = 7 and d = (11-7) = 4. Suppose there are n terms in the given AP. Then, `T_(n) = 139 rArr a + (n-1)d = 139` `rArr 7 + (n-1) xx 4 = 139` `rArr 4n = 136 rArr n = 34` Hence, there are 34 terms in the given AP.

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