Venus has found 5 foreign films and 4 local films she likes in a DVD shop, and she is going to buy 4 of them. Find number of combinations if at least 1 foreign film is brought.
Solution: 125
I need steps. thank you.
nPr and nCr 2
2010-08-07 7:11 am
回答 (1)
2010-08-07 7:18 am
✔ 最佳答案
The number of combinations if at least 1 foreign film is brought= The number of all combinations - The number of all are local films= 9C4 - 4C4= 126 - 1= 125
收錄日期: 2021-04-21 22:13:16
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