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已知全集U={1,2,3, 4,5,6},集合P={1,2,3,4},Q={3,4,5,6},则P
A.{1,2} B.{3,4} C. D.1
已知全集U={1,2,3,4,5,6},集合P={1,2,3,4},Q={2,3,4,6},则中的元素个数为 ( )
A.0 B.1 C.3 D.5