The first term, common difference and last term of an AP are 12,6 and 252 respectively. Find the sum of all terms of this AP.

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asked Feb 2, 2018 in Mathematics by Kundan kumar (49,132 points) 34 381 1015
The first term, common difference and last term of an AP are 12,6 and 252 respectively. Find the sum of all terms of this AP.

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answered Feb 2, 2018 by Vikash Kumar (144,729 points) 8 11 21
 
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We have, a=12, d=6 and I =252

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