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Math Help - Discreet Systems algebra question.

  1. #1
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    Discreet Systems algebra question.

    Im going over a solution to the following problem, and was stuck trying to figure out how to get the final answer. If i substitute (n-1)/2 for k i would get:

    ((n-1)/2)( ((n-1)/2 ) + 1) and not the final answer given in the solution given.

    problem 28:

    prove the following.


    the solution:
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  2. #2
    Super Member TheChaz's Avatar
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    You're saying that they aren't the same because...
    ( ((n-1)/2 ) + 1) isn't (n + 1)/2 ???

    In fact, they are equal.
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