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19 May, 04:54

The sum of three different positive integers is 12. show that one of them must be greater than 4.

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Answers (2)
  1. 19 May, 06:50
    0
    Let n = 1st positive interger

    n+1 = 2nd

    n + 2 = 3rd

    n+n+1+n+2 = 12

    3n + 3 = 12

    Minus 3 from 3 and 12

    3n = 9

    Divide 3n and 9 by 3

    n = 3

    So, the three intergers are 3, 4, and 5.
  2. 19 May, 08:21
    0
    If one is 4, then other may be 3 and so other 2 ... this will get you only 9.

    so it is understood that one must be greater than 4
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