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The third term of an A.P. is (1)/(5) and...

The third term of an A.P. is `(1)/(5)` and the 5th term is `(1)/(3)`. Show that the sum of 15 terms of the A.P. is 8.

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If the xth term of an A.P. is (1)/(y) and its yth term is (1)/(x) then show that its xyth term is 1 and the sum of its first xy terms is (1)/(2)(xy+1) .

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Knowledge Check

  • The 9th term of an A.P. is 449 and 449th term is 9. The term which is equal to zero is

    A
    508th
    B
    458th
    C
    501 th
    D
    None of the above

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