1.
Mr.Chan has 6 cups of ice-cream in his refrigerator.There are 5 different flavours as listed:
1 cup of chocolate
1 cup of mango
1 cup of peach
1 cup of strawberry and
2 cups of vanilla
Mr Chan randomly chooses 3 cups of ice-cream.Find the probability that there is excatly 1 cup of vanilla flavour ice-cream
probability
2012-03-13 12:18 am
回答 (1)
2012-03-13 12:33 am
✔ 最佳答案
P(There is excatly 1 cup of vanilla flavour ice-cream)= (1 among 2 cups of vanilla ways) (2 among other 4 flavours ways) / All ways
= (2C1) (4C2) / 6C3= 2 * 6 / 20
= 3/5
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