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If a*b=(a b)/(a+b) , find the value o...

If `a*b=(a b)/(a+b)` , find the value of `3*(3*-1)` . `-3` (b) `-1. 5` (c) `-1` (d) `2/3`

A

`-3`

B

`-(3)/(2)`

C

`-1`

D

`(2)/(3)`

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The correct Answer is:
A
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