从0,1,2,3,4,5,6,7,8,9十个数字中,选出一个偶数和三个奇数,组成一个没有重复数字的四位数,这样的四位数共有

A.1 480个            B.1 440个                 C.1 200个              D.1 140个

从0,1,2,3,4,5,6,7,8这九个数字中任取两个奇数和两个偶数，组成没有重复数字的四位

数，其中能被5整除的数的个数为（   ）

A．360                 B．720                 C．300                 D．240

已知U={1,2,3,4,5,6,7,8},A={1,3,5,7},B={2,4,5},则=

A.{6,8}                                B. {5,7}                        C. {4,6,7}                    D. {1,3,5,6,8}

设全集U={1,2,3,4,5,6,7,8}，集合S={1,3,5}，T={3,6}，则(S∪T)等于(    )

A.                 B.{2,4,7,8}               C.{1,3,5,6}               D.{2,4,6,8}

设全集U = {1,2,3,4,5,6,7,8},集合S = {1,3,5},T = {3,6}，则等于

A．Φ      B．{2,4,7,8}  C．{1,3,5,6}  D．{2,4,6,8}