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13INV 2015](1) 360(3) 370(2) 365(4) 375 |
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Answer» here a = 13 d=13 n=7. so. s=n/2(2a+(n-1)d) s=7/2(2*13+(7-1)13) =7/2(26+78) =7/2(104) =7*52 =364 so it is nearby 365 as per question |
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