Question

The first term and the last term of an arithmetic progression are ‘a’ and ‘l’ respectively, then the sum of its first ‘n’ terms is A. (2 ) 2 nal Sη + = B. ( ( 1) ) 2 na n d Sη + − = C. ( ) 2 na l Sη + = D. ( ) 2 an l Sη + =​

Answer 1

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Answer 2

Answer:

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