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A jar contains only red, yellow, and orange marbles. If there are 3 re [#permalink]
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16 Oct 2010, 05:28
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A jar contains only red, yellow, and orange marbles. If there are 3 red, 5 yellow, and 4 orange marbles, and 3 marbles are chosen from the jar at random without replacing any of them, what is the probability that 2 yellow, 1 red, and no orange marbles will be chosen? A. 1/60 B. 1/45 C. 2/45 D. 3/22 E. 5/22
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Last edited by Bunuel on 27 Sep 2014, 16:50, edited 1 time in total.
Renamed the topic, edited the question and added the OA.



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Re: A jar contains only red, yellow, and orange marbles. If there are 3 re [#permalink]
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16 Oct 2010, 06:22
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vanidhar wrote: A jar contains only red, yellow, and orange marbles. If there are 3 red, 5 yellow, and 4 orange marbles, and 3 marbles are chosen from the jar at random without replacing any of them, what is the probability that 2 yellow, 1 red, and no orange marbles will be chosen? A. 1/60 B. 1/45 C. 2/45 D. 3/22 E. 5/22 In total you have 3 different scenarios: (YYellow , RRed) YYR, RYY,YRY after you will calculate the probability for each of these scenarios you'll have the answer. YYR =\(\frac{5}{12}*\frac{4}{11}*\frac{3}{10}\) = \(\frac{5*4*3}{12*11*10}\) RYY =\(\frac{3}{12}*\frac{5}{11}*\frac{4}{10} = \frac{3*5*4}{12*11*10}\) YRY = \(\frac{5}{12}*\frac{3}{11}*\frac{4}{10} = \frac{5*3*4}{12*11*10}\) I intentionally don't calculate the fractions through because it is easier to reduce the fraction this way. Sum them up => \(\frac{3*(5*4*3)}{12*11*10} = \frac{3}{22}\) => answer D
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Re: A jar contains only red, yellow, and orange marbles. If there are 3 re [#permalink]
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27 Sep 2014, 16:39
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Re: A jar contains only red, yellow, and orange marbles. If there are 3 re [#permalink]
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28 Sep 2014, 01:44
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5C2*3C1=10*3=30 12C3=220
3/22
Answer: D



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Re: A jar contains only red, yellow, and orange marbles. If there are 3 re [#permalink]
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29 Nov 2014, 21:29
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For me, combinations work better. Ways for selecting 2 yellow marbles out of 5: 5C2 Ways for selecting 1 red marble out of 3: 3C1 Total no. of way for selecting 3 out of 12: 12C3 Probability: 5C2*3C1/12C3=3/22



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Re: A jar contains only red, yellow, and orange marbles. If there are 3 re [#permalink]
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10 Jan 2015, 04:32
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I started by finding the 2 probabilities, without calculation, like this: P(YYR) P(YRY) P(RYY)
I calculated the first one and ended in 1/22. I looked at the answer choices at this point and saw answer D: 3/22.
This helped me realise that for the 3 possible orderings the probabbility is the same. So, it should be (1/22)*(3), which indeed is 3/22.



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