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There are 9 boys and 15 girls in a class. 2 students are chosen at random 1 after the other without replacement. find the probability that 1) both are girls 2) they are of the opposite sex


Question asked by: ritisha

Asked on: 12 Sep 2010

Hopefully this is correct, a long time since I have done probability!

The first is: 15/24 x 14/23

The second is: 9/24 x 15/23 + 15/24 x 9/23

By: knowitall
Replied at: 12 Sep 2010
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Question Keywords

replacement  probability  without  opposite  sex  girls2  random  

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