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Re: GRE Math Challenge #86- A box contains 20 marbles all of [#permalink]
Answer is C
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Re: GRE Math Challenge #86- A box contains 20 marbles all of [#permalink]
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I also think C. There are 5 green marbles, 10 red marbles, and that means there must be 5 remaining that are neither red nor green. There is a 5/20 chance that the marble will be green. There is also a 5/20 chance it will be neither red nor green.
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Re: GRE Math Challenge #86- A box contains 20 marbles all of [#permalink]
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The solution is 'C' : Both quantities are equal

Explanation:
Total number of marbles = 20
Number of green marbles = 5
Number of red marbles = 10
Number of other colored marbles = 5
From a random draw on 20 marbles, probability of picking a green marble = 5/20 = 1/4 = P(G)
From a random draw on 20 marbles, probability of picking an other colored marble = 5/20 = 1/4 = P(OC)
We can see that P(G)=P(OC)=1/4
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Re: GRE Math Challenge #86- A box contains 20 marbles all of [#permalink]
Hello Sandy,

I strongly doubt the validity of the answer to this being A. Kindly show how the answer being A is achieved.

sandy wrote:
A box contains 20 marbles all of which are solid colored; 5 of the marbles are green and 10 of the marbles are fed.

Quantity A
Quantity B
The probability that a marble selected at random form the box will be green
The probability that a marble selected at random from the box will be neither red now green


• Quantity A is greater.
• Quantity B is greater.
• Both Quantities are Equal
• Cannot be determined
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Re: GRE Math Challenge #86- A box contains 20 marbles all of [#permalink]
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Hi,

The answer is indeed C. Fixed it.
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Re: A box contains 20 marbles all of which are solid [#permalink]
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Bump for further discussion
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Re: A box contains 20 marbles all of which are solid [#permalink]
Hello from the GRE Prep Club BumpBot!

Thanks to another GRE Prep Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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