 
			 
			MCQOPTIONS
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				| 1. | Let ‘*’ be defined on the set N. Which of the following are both commutative and associative? | 
| A. | a*b=a+b | 
| B. | a*b=a-b | 
| C. | a*b=ab2 | 
| D. | a*b=ab | 
| Answer» B. | |