The sum of n terms of the series 1.3^2+4.4^2+7.5^2+.......
(a) (n/12)(n+1)(9n2+49n+44)-8n
(b) (n/12)
(C) (n/6)(2n+1)(9m2+49n+44)-8n
(d) None
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Answer:
( A ) IS CORRECT ANSWER
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