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GRE Sample Question, explanation? Thanks!

  • Thread starter Brown399
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  • #1
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blu_ifxynot.gif


The correct answer is (1/y) - (1/xy) but i don't understand why

What does the sum of xy not equaling zero imply that we can do to the equation to solve it?
 

Answers and Replies

  • #2
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If xy != 0, then neither x nor y = 0.

Rewrite (x - 1)/(xy) as two separate fractions. What do you get?
 

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