7P5
The 7 and 5 are both small
How do I solve this step by step ?
2019-11-15 2:51 am
回答 (5)
2019-11-15 5:34 am
:-
7 !
--------
5 ! 2 !
42
---- = 21
2
7 !
--------
5 ! 2 !
42
---- = 21
2
2019-11-15 3:20 am
⁷P₅ = 7!/(7-5)!
= 7!/2! = (1×2×3×4×5×6×7)/(1×2)
= 3×4×5×6×7
= 2520
= 7!/2! = (1×2×3×4×5×6×7)/(1×2)
= 3×4×5×6×7
= 2520
2019-11-15 3:04 am
7!=7❌6❌5❌4❌3❌2❌1
2!= 2❌1
7!/2!=7❌6❌5❌4❌3=2520
2!= 2❌1
7!/2!=7❌6❌5❌4❌3=2520
2019-11-15 2:58 am
nPr = n! / (n - r)!
7! / (7 - 5)! =>
7! / 2! =>
5040 / 2 =>
2520
7! / (7 - 5)! =>
7! / 2! =>
5040 / 2 =>
2520
2019-11-15 2:52 am
收錄日期: 2021-04-24 07:44:37
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20191114185147AAHY4TJ