A) \[a*b=\sqrt{ab}\]
B) \[a*b=\frac{a-b}{a+b}\]
C) \[a*b=a+3b\]
D) \[a*b=3a-4b\]
Correct Answer: C
Solution :
Since, \[a,\,\,b\,\,\in \,\,N,\] \[\therefore \] \[a*\,b=a+3b\in N\] Hence, option is correct.
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