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

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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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