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30 Mar 2015, 05:44
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B
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72% (00:45) correct
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A box contains only white balls, red balls and green balls. What is the probability of selecting a ball that is either red or white?
(1) The probability of selecting a white ball at random is 2/5
(2) The probability of selecting a green ball at random is 1/3
Kudos for a correct solution.
(1) The probability of selecting a white ball at random is 2/5
(2) The probability of selecting a green ball at random is 1/3
Kudos for a correct solution.
30 Mar 2015, 05:47
Kudos
Bookmarks
Had this one in my Veritas CAT (screwed up there lol).
A box contains only white balls, red balls and green balls. What is the probability of selecting a ball that is either red or white?
(1) The probability of selecting a white ball at random is 2/5
(2) The probability of selecting a green ball at random is 1/3
1) - insufficient because you don't know what the probability of either red or green is.
2) sufficient, because you know the chance of not picking red or white is 1/3, so the change of picking red or white is 2/3.
B.
A box contains only white balls, red balls and green balls. What is the probability of selecting a ball that is either red or white?
(1) The probability of selecting a white ball at random is 2/5
(2) The probability of selecting a green ball at random is 1/3
1) - insufficient because you don't know what the probability of either red or green is.
2) sufficient, because you know the chance of not picking red or white is 1/3, so the change of picking red or white is 2/3.
B.
30 Mar 2015, 10:37
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Bunuel
Our goal is to find P(red or white). Since there are only red, white, and green balls, this probability is the same as 1- P(green). So, either we need both values for P(red) and P(white)or a value for P(green).
(1) P(white) = 2/5. Not sufficient. We need P(red).
(2) P(green) = 1/3. Sufficient. We know that P(red or white) = 2/3.
Answer: B.
