求关于子集的公式How mary subsets(子集)of one or more element can be formed form a set containing 12 elements?

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求关于子集的公式How mary subsets(子集)of one or more element can be formed form a set containing 12 elements?
求关于子集的公式
How mary subsets(子集)of one or more element can be formed form a set containing 12 elements?

求关于子集的公式How mary subsets(子集)of one or more element can be formed form a set containing 12 elements?
含有n个元素的集合有2^n个子集,所以含有12个元素的集合就有2^12个子集.(注意:2^n表示2的n次方,2^12表示2的12次方 )