GRE Prep Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
A box contains 20 marbles all of which are solid
[#permalink]
Updated on: 11 Dec 2019, 09:47
Updated on: 11 Dec 2019, 09:47
Expert Reply
1
Bookmarks
00:00
Question Stats:
85% (00:40) correct
14% (00:37) wrong based on 109 sessions
Hide Show timer Statistics
A box contains 20 marbles all of which are solid colored; 5 of the marbles are green and 10 of the marbles are red.
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 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 nor green |
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
Re: GRE Math Challenge #86- A box contains 20 marbles all of
[#permalink]
18 Aug 2016, 06:17
18 Aug 2016, 06:17
1
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: The probability that a marble selected at random form the box will be green
Quantity B: 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
Quantity A: The probability that a marble selected at random form the box will be green
Quantity B: 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
in this for quantity A, the probability will be 5/20 = 1/4. when it comes to quantity B, the probability is found out using P(A)*P(B) = (5/20)*(10/20) = 1/8
so the answer is A
Re: GRE Math Challenge #86- A box contains 20 marbles all of
[#permalink]
18 Aug 2016, 11:36
18 Aug 2016, 11:36
1
I think both quantities are equal and answer is (C). This is my solution to this problem:
Let probability of selecting a green marble at random from the box is P(G) & probability of selecting a red marble at random from the box is P(R) & probability of selecting a marble at random from the box that is neither nor green is is P(neither G nor R)
P(G)*P(R) = 0, as both are mutually exclusive events.
Quantity A : P(G) = (5/20) =(1/4) ; B : P(neither G nor R) = 1 – (P(G)+P(R)) = 1 – ((5/20)+(10/20)) = 1/4
Let probability of selecting a green marble at random from the box is P(G) & probability of selecting a red marble at random from the box is P(R) & probability of selecting a marble at random from the box that is neither nor green is is P(neither G nor R)
P(G)*P(R) = 0, as both are mutually exclusive events.
Quantity A : P(G) = (5/20) =(1/4) ; B : P(neither G nor R) = 1 – (P(G)+P(R)) = 1 – ((5/20)+(10/20)) = 1/4
