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If the sum of first 8 terms of an AP is 50 and that of 17 terms is 289,find the sum of n terms

Posted by Rizwana Khatoon 5 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Mehak Bajaj 5 years, 2 months ago

In this question , you know that S8 = 8/2 ( 2a + (8-1)d ) You will get an equation from this and from S17 as well By combining these two equation by elimination or by any other method you will find d and after that you have to put the value of d in Sn = n/2 ( 2a + (n-1)d ) and at last you will get the answer ( the answer can also be a quadratic equation ) .

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