✨ Best Answer ✨
(1) 每位數字都有5種數字可以選
所以 5⁴ = 625
(2) 反面好算，找完全不同的
也就是 P⁵₄ = 120
625 - 120 = 505
Mathematics
Senior High
Resolved
求解
3026
158
單元4排列
15. 用1,2,3,4,5共五個數字,作出數字可重複的四位數。
(1)共有多少個?
(2)有相同數字者(如1114,55668888)有多少個?
25.
Answers
Were you able to resolve your confusion?
Users viewing this question
are also looking at these questions 😉
