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If the sum of n terms of A.P. is (1)/(2)...

If the sum of n terms of A.P. is `(1)/(2) (3n^(2) + 7n)` , find its `n^(th)` term and write its 25th term.

Text Solution

Verified by Experts

The correct Answer is:
`= 5+24 (3) = 5+ 72 = 77`.
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Knowledge Check

  • If the sum of first n terms of an A.P. is cn^(2) , then the sum of squares of these n terms is :

    A
    `( n ( 4n^(2) - 1) c^(2))/( 6)`
    B
    `( n ( 4n^(2) + 1) c^(2))/( 3)`
    C
    `( n ( 4n^(2) - 1) c^(2))/( 3)`
    D
    `( n ( 4n^(2) + 1) c^(2))/( 6)`

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