What number should come next in these sequences? 1, 2, 5, 10, 17, ______ 100, 90, 81, 73, 66, ______

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问题 What number should come next in these sequences? 1, 2, 5, 10, 17, ______ 100, 90, 81, 73, 66, ______

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答案26:60

解析 (第一个空,相邻两个数之间的差为递进奇数(1,3,5,7,9……),所以17+9=26。第二个空相邻两个数之间的差从10开始依次递减(10,9,8,7,6……),所以66—6=60。)
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