AMC 10 2000 Problem 15

Past Contests AMC 10 AMC 10 - 2000
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Two non-zero real numbers, a and b, satisfy a b=a-b. Find a possible value of \dfrac{a}{b}+\dfrac{b}{a}-a b.

Answer Choices

A. -2

B. -\dfrac{1}{2}

C. \dfrac{1}{3}

D. \dfrac{1}{2}

E. 2