 
			 
			MCQOPTIONS
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				| 1. | An element of a commutative ring R(1 0) is nilpotent if __________ | 
| A. | a+1=0 | 
| B. | a<sup>n</sup> = 0, for some positive integer n | 
| C. | a<sup>n</sup> = 1, for some integer n | 
| D. | a<sup>2</sup> = 0 | 
| Answer» C. a<sup>n</sup> = 1, for some integer n | |