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2n(A-B)=n(A-B) and 5n(AnnB)=n(A)+3n(B) ...

`2n(A-B)=n(A-B)` and `5n(AnnB)=n(A)+3n(B)` If `n(AuuB)lt=10 ,` then the value of `(n(A)dotn(B)dotn(AnnB))/8` is 36 (2) 72 (3) 90 (4) 70

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