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GRE Math Challenge #130-A marble is to be drawn at random
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Updated on: 20 Feb 2020, 16:03
Updated on: 20 Feb 2020, 16:03
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Question Stats:
89% (00:27) correct
10% (00:28) wrong based on 178 sessions
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A marble is to be drawn at random from a bag that contains 2 yellow marbles, 4 blue marbles, 6 green marbles, and no other marbles.
A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.
Kudos for the right answer and explanation
Quantity A |
Quantity B |
The probability that the marble drawn will be green |
The probability that the marble drawn will be yellow or blue |
A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.
Kudos for the right answer and explanation
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Given Kudos: 136
Re: GRE Math Challenge #130
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16 May 2015, 14:26
16 May 2015, 14:26
2
sandy wrote:
A marble is to be drawn at random from a bag that contains 2 yellow marbles, 4 blue marbles, 6 green marbles, and no other marbles.
Quantity A: The probability that the marble drawn will be green
Quantity B: The probability that the marble drawn will be yellow or blue
Quantity A: The probability that the marble drawn will be green
Quantity B: The probability that the marble drawn will be yellow or blue
TOTAL number of marbles = 2 + 4 + 6 = 12
P(green marble) = 6/12
P(yellow or blue marble) = (2 + 4)/12 = 6/12
We get:
Quantity A: 6/12
Quantity B: 6/12
Answer:
Show: ::
C
Cheers,
Brent
Re: GRE Math Challenge #130-A marble is to be drawn at random
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12 Jun 2020, 17:34
12 Jun 2020, 17:34
Since the quantity is the same 4+2 = 6 and green are 6, the probability is the same. The answer is C.
