the sum of the first 9 terms of an ap is 81 and the sum of its first 20 terms is 400 find the first term the common difference and the sum upto 15 term....
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Ans. :- common difference (d) = 2 .. and,
sum of first 15 terms is 225 ...
solution is in the attached pic :)
sum of first 15 terms is 225 ...
solution is in the attached pic :)
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