FERMAT 2006 Problem 11

Past Contests FERMAT FERMAT - 2006
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1

If \displaystyle\frac ab=3 and \displaystyle\frac bc=2, then the value of \displaystyle\frac{a-b}{c-b} is

Answer Choices
A. -4
B. -\frac13
C. \frac23
D. 2
E. 6