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4. Let = = {x :x 6 N, 5 < x < 20}, X = {x : Xe N, 10 < x < 20}, Y = {x : X N, 2x < 30). Find a. n(XUY) b. n(X n Y)c. n(X')d. n(X'OY')e. n(XU Y)' f. n(X - Y)Verify that n(XU Y) = n(X) + n( Y) – n(Xn Y). |
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