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If a\ a n d\ b are two numbers such tha...

If `a\ a n d\ b` are two numbers such that `a b\ =\ 0` , then (a)`a\ =\ 0\ a n d\ b\ =\ 0` (b) `a\ =\ 0\ or\ b\ =\ 0` (c) `a\ =\ 0\ a n d\ b!=0` (d) `b\ =\ 0\ a n d\ a!=0`

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