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Source: Beat The GMAT — Problem Solving |
this means:ajmoney09 wrote:If b Does not equal 1, what is the value of a in terms of b in (ab/a-b)=1
ab=a-b
or ab-a+b=0
a(b-1)+b=0
a(b-1)=-b
a=-b/b-1
a= b/1-b
This is why the stem says b is not equal to 1 because otherwise we will have
a=b/0 which is not defined.
LGTCH
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