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In jar A there are 3 white balls and 2 green ones, in jar B

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Manager
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Joined: 13 Jun 2005
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Location: Haverhill, MA
In jar A there are 3 white balls and 2 green ones, in jar B  [#permalink]

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New post 26 Jan 2006, 18:16
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In jar A there are 3 white balls and 2 green ones, in jar B there is one white ball and three green ones. A jar is randomly picked, what is the probability of picking up a white ball out of jar A?

a) 2/5.
b) 3/5.
c) 3/10.
d) 3/4
e) 2/3.

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New post 26 Jan 2006, 21:14
The ans should be 3/10 .

Because the probability of selecting jar A is 1/2

and the probability of choosing a white ball from jar A is 3/5

hence the probability is (1/2) * (3/5) = 3/10 .
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New post 26 Jan 2006, 23:38
Agree with the ELOGL( Extra ordinary league of ....)
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New post 27 Jan 2006, 08:34
The probability of picking the first jar is ½, the probability of picking up a white ball out of jar A
Is 3/(3+2) = 3/5. The probability of both events is 1/2 x 3/5 = 3/10.

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Re: In jar A there are 3 white balls and 2 green ones, in jar B  [#permalink]

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New post 19 Aug 2018, 09:36
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Re: In jar A there are 3 white balls and 2 green ones, in jar B &nbs [#permalink] 19 Aug 2018, 09:36
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