驗證網址talk.collegeconfidential.com安全性

nPr and nCr - College Confidential

Could someone explain the difference for me and maybe give an example? nPr is where the probability must be done in a certain way and nCr is any way? ... not really...the words in the problem say it. for example, if you have to find how many diff 'combina...

網址安全性掃描由 google 提供