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Question -

In an A.P., the sum of first n terms is (3n2/2)+(13/2)n. Find its 25th term. [CBSE 2006C]



Answer -


a25 = 8 + (25 – 1) x 3 = 8 + 24 x 3 = 8 + 72 = 80
Hence 25th term = 80

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