从集合{1,2,3,4,5,6,7,8,9,10}中任选3个不同的数,如果着三个数经过适当的排列成等差数列则这样的等差数列一共有A.10个B.20个C.40个D.120个麻烦说明理由,
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![从集合{1,2,3,4,5,6,7,8,9,10}中任选3个不同的数,如果着三个数经过适当的排列成等差数列则这样的等差数列一共有A.10个B.20个C.40个D.120个麻烦说明理由,](/uploads/image/z/645351-15-1.jpg?t=%E4%BB%8E%E9%9B%86%E5%90%88%7B1%2C2%2C3%2C4%2C5%2C6%2C7%2C8%2C9%2C10%7D%E4%B8%AD%E4%BB%BB%E9%80%893%E4%B8%AA%E4%B8%8D%E5%90%8C%E7%9A%84%E6%95%B0%2C%E5%A6%82%E6%9E%9C%E7%9D%80%E4%B8%89%E4%B8%AA%E6%95%B0%E7%BB%8F%E8%BF%87%E9%80%82%E5%BD%93%E7%9A%84%E6%8E%92%E5%88%97%E6%88%90%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%E5%88%99%E8%BF%99%E6%A0%B7%E7%9A%84%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%E4%B8%80%E5%85%B1%E6%9C%89A.10%E4%B8%AAB.20%E4%B8%AAC.40%E4%B8%AAD.120%E4%B8%AA%E9%BA%BB%E7%83%A6%E8%AF%B4%E6%98%8E%E7%90%86%E7%94%B1%2C)
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