设m,n为正整数,m>n,集合A{1,2,3,...m}.集合B{1,2,3,...n},则满足B∩C≠空集的A的子集C共有______个.
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![设m,n为正整数,m>n,集合A{1,2,3,...m}.集合B{1,2,3,...n},则满足B∩C≠空集的A的子集C共有______个.](/uploads/image/z/9275314-58-4.jpg?t=%E8%AE%BEm%2Cn%E4%B8%BA%E6%AD%A3%E6%95%B4%E6%95%B0%2Cm%3En%2C%E9%9B%86%E5%90%88A%7B1%2C2%2C3%2C...m%7D.%E9%9B%86%E5%90%88B%7B1%2C2%2C3%2C...n%7D%2C%E5%88%99%E6%BB%A1%E8%B6%B3B%E2%88%A9C%E2%89%A0%E7%A9%BA%E9%9B%86%E7%9A%84A%E7%9A%84%E5%AD%90%E9%9B%86C%E5%85%B1%E6%9C%89______%E4%B8%AA.)
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