在集合S={ 1,2,3,4,.,30}的12元子集T={a1,a2,a3,.,a12}中,恰有两个元素的差的绝对值等于1,这样的12元子集T的个数为?19C1 11
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![在集合S={ 1,2,3,4,.,30}的12元子集T={a1,a2,a3,.,a12}中,恰有两个元素的差的绝对值等于1,这样的12元子集T的个数为?19C1 11](/uploads/image/z/11643198-6-8.jpg?t=%E5%9C%A8%E9%9B%86%E5%90%88S%3D%7B+1%2C2%2C3%2C4%2C.%2C30%7D%E7%9A%8412%E5%85%83%E5%AD%90%E9%9B%86T%3D%7Ba1%2Ca2%2Ca3%2C.%2Ca12%7D%E4%B8%AD%2C%E6%81%B0%E6%9C%89%E4%B8%A4%E4%B8%AA%E5%85%83%E7%B4%A0%E7%9A%84%E5%B7%AE%E7%9A%84%E7%BB%9D%E5%AF%B9%E5%80%BC%E7%AD%89%E4%BA%8E1%2C%E8%BF%99%E6%A0%B7%E7%9A%8412%E5%85%83%E5%AD%90%E9%9B%86T%E7%9A%84%E4%B8%AA%E6%95%B0%E4%B8%BA%3F19C1+11)
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