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+1 vote
2.6k views
in Mathematics by (2.5k points)

If X and Y are two sets such that n(X) = 17, n(Y) = 23 and n(X ∪ Y) = 38, find n(X ∩Y). 

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+1 vote
by (2.5k points)
 
Best answer

solution: we know

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