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05阶乘与双阶乘
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Published
10/05/2024
给定一个正整数 \(n\), 称小于或等于 \(n\) 且与之同奇偶的所有正整数的积为 “ \(n\) 的双阶乘”,记作 \(n !\) !, 即\[n ! ! \xlongequal{\text { def }} \begin{cases}\text{____}, & n \text { …
Published
10/05/2024
给定一个正整数 \(n\), 称所有小于或等于 \(n\) 的正整数的积为 “ \(n\) 的阶乘, 记作\(n\) ! , 即\[n ! \xlongequal{\text { def }} \prod_{k=1}^n k=\text{______}\]特别地, 规定 \(0 !=\)_____.
Published
10/05/2024
偶数的双阶乘\((2 n) ! !=\text{______.}\)
Published
10/05/2024
奇数的双阶乘\((2 n-1) ! !=\text{______.}\)
Published
10/05/2024
阶乘表格 n!=____(2n)!!=____(2n-1)!!=____
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