已知全集U={1,2,3,4,5,6,7,8,9},∁U(A∪B)={1,3},A∩{∁UB}={2,4},求集合B.
问题描述:
已知全集U={1,2,3,4,5,6,7,8,9},∁U(A∪B)={1,3},A∩{∁UB}={2,4},求集合B.
答
∵全集U={1,2,3,4,5,6,7,8,9},∁U(A∪B)={1,3},
∴A∪B={2,4,5,6,7,8,9},
又∵A∩{∁UB}={2,4},
∴B={5,6,7,8,9}.