设全集I={x|1≤x<9,x属于N},求满足{1,3,5,7,8}与B的补集的集合为{1,3,5,7}的所有集合B的个数

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设全集I={x|1≤x<9,x属于N},求满足{1,3,5,7,8}与B的补集的集合为{1,3,5,7}的所有集合B的个数设全集I={x|1≤x<9,x属于N},求满足{1,3,5,7,8}与B的补集

设全集I={x|1≤x<9,x属于N},求满足{1,3,5,7,8}与B的补集的集合为{1,3,5,7}的所有集合B的个数
设全集I={x|1≤x<9,x属于N},求满足{1,3,5,7,8}与B的补集的集合为{1,3,5,7}的所有集合B的个数

设全集I={x|1≤x<9,x属于N},求满足{1,3,5,7,8}与B的补集的集合为{1,3,5,7}的所有集合B的个数
因为x属于自然数满足{1,3,5,7,8,}
所以B补集肯定含有1,3,5,7
B={2},{4},{6},{8},{9},{2,4}~
共13种

B={2},{4},{6},{8},{9},{2,4}~~~~~~~~
共13种