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On the set of all natural number N, whic...

On the set of all natural number N, which one of the following * is a binary operation?

A

`a*b=a+3b`

B

`a*b=3a-4b`

C

`a*b=sqrt(ab)`

D

`a*b=(a-b)/(a+b)`

Text Solution

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The correct Answer is:
A
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