How manyterms of the A.P. 63, 60, 57, .... must be taken so that their – InterviewSolution

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1.	How manyterms of the A.P. 63, 60, 57, .... must be taken so that their sum is 693?
Answer» Correct Answer - n = 21 or n = 22, 22nd term is 0 `n^(2) -43n + 462 = 0 rArr n^(2) - 21n - 22n + 462 = 0`

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