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換個排列方式: 123 234 345 456 …… 第50個數是多少? 每行第一個數是有順序的排列的,即為第幾行,每行是3個連續的自然數. 50÷3=16……2 第50個數在第16+1=17行,17行的第二個數是18,囙此第50個數是18.
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