MATH!!!

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I tried to multiply the equation by a then b then c... I don't know please help by showing the steps I am very lost
Determine a+b+c
25/84=1/a+1/an+1/abc

  • MATH!!! -

    Sorry it was supposed to be
    Determine a+b+c
    25/84=1/a+1/ab+1/abc

  • MATH!!! -

    It's hard to explain.

    Because of that in google type:

    CRUX MATHEMATICORUM Contest Corner Problem CC210

    When you see list of results click on:

    There are exactly two positive integer triples (a , b , c) such that , 25/84 ...

    and read answer.

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