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$ a$ and $ b$ are positive integers smaller than $ 10$ such that $ \frac{ab}{a + b} = \frac{12}{7}$. Find all possible values of a and b

 Aug 24, 2021
 #1
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(a,b) = (2,5).

 Aug 24, 2021
 #2
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(a,b)=(3,4) and (4,3)

 Aug 24, 2021

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