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M02#6

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M02#6 [#permalink] New post 03 Jan 2011, 10:54
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Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
If a group of five women is participating in a 400 meter race in preparation for the Olympics, then what is the probability that either Jenny or Sally win the race?

1/5
14/15
2/5
1/2
3/5

P(j) = 1/5
P(s)=1/4

p ( j or s ) = 1/5 +1/4 = 9/20

what's going wrong :(
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Re: M02#6 [#permalink] New post 03 Jan 2011, 11:21
1/5 + 1/5 = 2/5 ?

Since they cannot both win, (PnB) = 0, and P(AuB) = P(A)+P(B)+0
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Re: M02#6   [#permalink] 03 Jan 2011, 11:21
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