集合A={0,1},则满足AUB={0,1,2}的集合B的个数是?

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集合A={0,1},则满足AUB={0,1,2}的集合B的个数是?
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集合A={0,1},则满足AUB={0,1,2}的集合B的个数是?
集合A={0,1},则满足AUB={0,1,2}的集合B的个数是?

集合A={0,1},则满足AUB={0,1,2}的集合B的个数是?
B={2},{0,2},{1,2},{0,1,2}四个

4个
分别为:
{2}
{0,2}
{1,2}
{0,1,2}

4个。{0,2},{1,2},{2},{0,1,2}