Permutation

👨🏻‍🏫 學術台數學

[匿名]

2010-12-12 8:42 pm

Find the number of arrangement of a 5 digit number if there is no repeated number. Assume leading digit can be zero.

回答 (4)

用戶46949

2010-12-13 12:34 am

✔ 最佳答案

10P5 =30240 arrangement (choose 5 from 10 digits)

2010-12-12 16:52:34 補充：
10! / 5!
=10 x 9 x 8 x 7 x 6 = 30240

👍 0 👎 0

[匿名]

2010-12-12 11:28 pm

這裏可以幫到你 http://aciwniaw.xghost1.highspeed2012.info/yahoo.com.hk/hk/auction/178987536

👍 0 👎 0

用戶9112

2010-12-12 10:20 pm

10x9x8x7x6

👍 0 👎 0

良師益友

2010-12-12 9:05 pm

If you have any 5 different digits with the leading zero accepted,
the number of arrangements = 5! ( or 5P5 ) = 5x4x3x2x1 = 120

參考: Mathematics Teacher Mr. Ip

👍 0 👎 0