請算出C(5,2)?
回答 (1)
2015-12-08 3:42 pm
C(5,2)
= 5! / [2! × (5-2)!]
= 5 × 4 × 3! / [2! 3!]
= 5 × 4 / 2
= 10
= 5! / [2! × (5-2)!]
= 5 × 4 × 3! / [2! 3!]
= 5 × 4 / 2
= 10
收錄日期: 2021-04-18 14:16:39
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