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irst 25 terms in an A.P is 525.Andthesumofnen217. The suterms of the same A.Ris 725. What is thee A.is 725. What is the common difference |
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Answer» sum of first 25 terms of an A.P is 525we know that s(25)=n/2(2a+(n-1)d)=25/2(2a+24d)=525-(1)sum of next 25 terms of an A.P is 725,so that total number of terms is 50so that it can be written as 50/2(2a+49d)=(725+525)-(2)1 can be written as 2a+24d=42-(3)2 can be written as 2a+49d=5o-(4)so that 3&4 is solved,we get 25d=8=>d=8/25common difference is 8/25. |
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