blue0612
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A team of four is selected from a group of 4 girls and 5 boys.
a) How many different selections are possible?
b) What is the probability that the team will be all boys?
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Muttley79
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(Original post by blue0612)
A team of four is selected from a group of 4 girls and 5 boys.
a) How many different selections are possible?
b) What is the probability that the team will be all boys?
How far have you got?
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blue0612
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(Original post by Muttley79)
How far have you got?
a) So I did:
4g = 4c4 = 1
3g and 1b = 4c3 x 5c1 = 4x5 = 20
2g and 2b = 4c2 x 5c2 = 6x10 = 60
1g and 2b = 4c1 x 5c3 = 4x10 = 40
4b = 5c4 = 5

Total = 126

Probability of being all boys = 5/126
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