If the sum of first seven terms of an A.P is 49 and the sum of it's first seventeen terms is 289, find the sum of first n terms of the A.P
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Hope this helps u.....
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yamini999:
Sorry I actually I found out an instead of sn ... so sn = n/2 (2 a +( n-1) d ) = n ^2
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I hope it will help you!!!!
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