the sum of n terms of an ap is 3n*+5n. Find the ap hence, fimd its 15th term.
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put the value of nth term as 1,2,3.....
then find the Ap and then put formula tk find 15th term
i.e (a + 14d)
then find the Ap and then put formula tk find 15th term
i.e (a + 14d)
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