Question

设全集U={1,2,3,4,5,6},集合A,B都是U的子集，若A交B={1,3,5}则称A,B为 理想配集 ，记{A,B},这样共有几对

把他们都列举出来 谢咯！

Answer 1

56组，反过来也是
{1,3,5}{1,2,3,5}
{1,3,5}{1,3,4,5}
{1,3,5}{1,3,5,6}
{1,3,5}{1,2,3,4,5}
{1,3,5}{1,2,3,5,6}
{1,3,5}{1,3,4,5,6}
{1,3,5}{1,2,3,4,5,6}
{1,2,3,5}{1,3,4,5}
{1,2,3,5}{1,3,5,6}
{1,2，3,5}{1,2,3,4,5}
{1,2,3,5}{1,3,4,5,6}
{1,2,3,5}{1,2,3,5,6}
{1,2,3,5}{1,2,3,4,5,6}
{1,3,4,5}{1,3,5,6}
{1,3,4,5}{1,2,3,4,5}
{1,3,4,5}{1,3,4,5,6}
{1,3,4,5}{1,2,3,5,6}
{1,3,4,5}{1,2,3,4,5,6}
{1,3,5,6}{1,2,3,4,5}
{1,3,5,6}{1,3,4,5,6}
{1,3,5,6}{1,2,3,5,6}
{1,3,5,6}{1,2,3,4,5,6}
{1,2,3,4,5}{1,2,3,5,6}
{1,2,3,4,5}{1,3,4,5,6}
{1,2,3,4,5}{1,2,3,4,5,6}
{1,2,3,5,6}{1,3,4,5,6}
{1,2,3,5,6}{1,2,3,4,5,6}
{1,3,4,5,6}{1,2,3,4,5,6}

Answer 2

好吧
楼上的你赢了！~