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For an A.P., it is given that the first term (a) = 5, common difference (d) = 3, and the nth term (an) =

For an A.P., it is given that the first term (a) = 5, common difference (d) = 3, and the nth term (an) = 50. Find n and sum of first n terms (Sn) of the A.P.

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