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標題: Combinations [打印本頁]

作者: chikit001 時間: 11-3-19 01:08 PM 標題: Combinations

1. Michael tosses a coin 4 times. Among the 4 tosses, how many combinations show 2 heads and 2 tails?

2. A dice is thrown twice. How many combinations are there for one of the numbers shown up being '5'?

作者: nkc20031101 時間: 11-4-27 04:07 PM

新手一試，有錯請更正...
1.Assumed the coin is fair.
2 head 2 tail=(4C2)=6
2.Assumed the die is fair.
At least one "5" is obtained=2(6C1)=12

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