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nA=35 andnB=42 ,n A intersecrion B=1 so find that A-B=? |
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Answer» n(A-B)=34 . I can be wrong but i did it this way that nA-B equals to no. Of elements in A which are not present in B . But nA^B=1 says that there is one common element in A and B.so we remove that element. And get 34 elements n(A-B)=76 |
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