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07 Aug 2009, 11:48
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not sure why B is sufficient? Their explanation was hard to follow and looked pretty time consuming...
A jar contains 8 red marbles and y white marbles. If Joan takes 2 random marbles from the jar, is it more likely that she will have 2 red marbles than that she will have one marble of each color?
(1) y ≤ 8
(2) y ≥ 4
A jar contains 8 red marbles and y white marbles. If Joan takes 2 random marbles from the jar, is it more likely that she will have 2 red marbles than that she will have one marble of each color?
(1) y ≤ 8
(2) y ≥ 4
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07 Aug 2009, 12:38
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if y = 4,
so the probability of having two colors is 8*4/11*12
and probability of having two red is 8*7/11*12 clearly u have a bigger chance getting 2 reds
if y > 8 as is included in statement 2, then we can have y = 16
so the probability of having two colors is 8*15/24*23
while probability of having two red is 8*7/24*23 exactly opposite of when y = 4.
so statement 2 alone is not sufficient..
so is statement 1 because when y = 8, you have a bigger chance of getting two color than two reds while the other way around when y < 8.
i would go with E.
so the probability of having two colors is 8*4/11*12
and probability of having two red is 8*7/11*12 clearly u have a bigger chance getting 2 reds
if y > 8 as is included in statement 2, then we can have y = 16
so the probability of having two colors is 8*15/24*23
while probability of having two red is 8*7/24*23 exactly opposite of when y = 4.
so statement 2 alone is not sufficient..
so is statement 1 because when y = 8, you have a bigger chance of getting two color than two reds while the other way around when y < 8.
i would go with E.
07 Aug 2009, 13:21
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sprtng
Yeah, E is what I put, but apparently it was wrong. I approached it almost the same way as you did. The right answer was B...
BTW, this was my 2nd question in the quant section MGMAT...it even said my 1st question was 600-700 level after i finished the test...I thought you start with a 500 level for the 1st question in each section???
