Question

If the first m terms of an A.P. is 2m2+3m, then what is its second term?

Answer 1

Sm = 2m2 + 3m

putting m = 1

S1 = 2 + 3 = 5

S2 = 8 + 6 = 14

S3 = 18 + 9 = 27

Hence , a = 5

and d = 9 - 5 = 4 (14 -5 = 9 )

Second term = a+d = 5 + 4 = 9

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