1/a-1/b=1/c solve for c. thanks
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Originally Posted by Geomatt 1/a-1/b=1/c solve for c. thanks $\displaystyle \frac {1}{a} - \frac {1}{b} = \frac {1}{c}$ $\displaystyle \Rightarrow \frac {b - a}{ab} = \frac {1}{c}$ $\displaystyle \Rightarrow \frac {ab}{b - a} = c$
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