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Probability Question

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Probability Question

by anubhavgulati » Fri Jul 22, 2011 8:33 pm
Hi All,

Probability question:

If there are 5 apples, out of which 1 is rotten apple and rest 4 are good apples. What is the probability that if you select 2 apples out of which 1 apple must be a rotten apple.

Please let me know how to solve this question.

Thanks,
Anubhav

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Hi All,
I found the solution, thanks.
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by ntamhane » Fri Jul 22, 2011 10:02 pm
No. of ways selecting 2 apples is 5!/3!*2! = 10 ways
No. of ways selecting 2 good apples = 4!/2!*2! = 6ways
P(selecting 2 good apples)=6/10
P(selecting 1 rotten apple)=1-(6/10)= [spoiler]2/5[/spoiler]

Whats he OA?
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