1.   Find the sum of the series .
    A. B.
    C. D. 9
    Hint

  2.   Find the sum of the series .
    A. B.
    C. D. The sum does not exist.
    Hint

  3.   Find
    A. 0 B. 1
    C. -1 D.
    Hint

  4.   Find the sum of the series
    A. 18 B. The sum does not exist.
    C. D. 24
    Hint

  5.   Write as a fraction.
    A. B.
    C. D.
    Hint