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单词 triangular number
释义

triangular number

noun

: a number (such as 3, 6, 10, 15) representable by that many dots arranged in rows that form a triangle and that equals {latex}\\frac{n(n + 1)}{2}{/latex} for some positive integer value of n

Word History

First Known Use

1795, in the meaning defined above

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更新时间:2025/3/23 6:30:59