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    				| 1. | If `A=(1,2,3)` and `B=(2,6,7)`, then `(A-B)cup(B-A)=`A. `phi`B. `mu`C. `(1,2,3,6,7)`D. `(1,3,6,7)` | 
| Answer» Correct Answer - D `x in A -BrArr x in A` and `x cancelin B`. | |