On a table there are 12 balls of different colours. If 6 of the balls are put into a bag and one particular ball must be selected, how many combinations of balls are there?
THX
數學問題 40分
2010-12-05 3:17 am
回答 (1)
2010-12-05 5:34 am
✔ 最佳答案
If one ball must be chosen, then that means 5 more balls must be chosen from among the remaining 11 balls. There are 11C5 =462 ways to do it.
收錄日期: 2021-04-23 23:24:26
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https://hk.answers.yahoo.com/question/index?qid=20101204000051KK01170