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# There are five balls in a bag. Two of them are red and three

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Manager
Joined: 24 Jun 2003
Posts: 91
Location: Moscow
Followers: 1

Kudos [?]: 1 [0], given: 0

There are five balls in a bag. Two of them are red and three [#permalink]  11 Aug 2003, 06:46
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There are five balls in a bag. Two of them are red and three are green. Find the probability that after taking of three random balls and consecutively returning of two random balls to the bag the rest ball is red.
Manager
Joined: 10 Jun 2003
Posts: 210
Location: Maryland
Followers: 2

Kudos [?]: 5 [0], given: 0

I think this would just be the same as picking one ball out of the group of five.

Since there are two red balls and a total of five balls, then the asnwer would be 2/5.

Does anyone think that the answer is more complicated than this?
Manager
Joined: 25 Jun 2003
Posts: 95
Followers: 1

Kudos [?]: 0 [0], given: 0

Alternately, There must be AT LEAST one Red ball ..
Probability that no RED ball is selected = 3/5
so probability at least one Red ball is selected = 1 - 3/5 = 2/5
_________________

Brainless

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