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a,b,c,d都属于1,2,3,4; (2)a≠b,b≠c,c≠d,d≠a; (3)a是a,b,c,d中的最小数. 那么,可以组成的不同的四位数abcd的个数是______.

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={0,1,2,3},  ={1,2,4},则集合A.∪B.= (  ) A.{0, 1,2,3,4}B.{1,2,3,4}   {1,2}  {0}  
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