Question 337060
Since x * y = x-y, this means that a*b = a-b. So if a=b, then a*b=a-b=a-a=0. So (I) is true.



So because x * y = x-y, we can also say that (a+b)*b = (a+b)-b = a. But if 'a' is a is a positive integer, then 'a' is NOT zero. So (II) is NOT true.



In a similar (but slightly different) fashion, (III) is also false using the same reasoning above.


So only (I) is true. 


So the answer is A)



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Jim