Which number should come next in this series? 25, 24, 22, 19, 15, ?

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问题 Which number should come next in this series? 25, 24, 22, 19, 15, ?

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答案10

解析 (分析可知:数列中前后两个数字之差递增,分别为1,2,3,4,那么下一个差应为5,因此15应减5,即10。)
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