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Question -

If the sum of┬аn┬аterms of an A.P. is┬а3n2┬а+5n and its┬аmth┬аterm is 164, find the value of┬аm.



Answer -

LetтАЩs consider┬аa┬аand┬аb┬аtobe the first term and the common difference of the A.P. respectively.

am┬а=┬аa┬а+ (m┬атАУ1)d┬а= 164 тАж (1)

We the sum of theterms is given by,

Sn┬а=n/2 [2a + (n-1)d]

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