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03 Dec 2016, 18:21
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3 colors (blue white red)
You draw a marble from each bag what is the probability of drawing at least 2 blue marbles?
B W B *
B W W
B W R
B R B *
B R W
B R R
B B B *
B B W *
B B R *
W W B
W W W
W W R
W R B
W R W
W R R
W B B *
W B W
W B R
R W B
R W W
R W R
R R B
R R W
R R R
R B B *
R B W
R B R
So I marked down all of the possible outcomes and I get 7/27 but it doesn't make sense to me to include the same blue marbles twice because the third color is different
So that gives me 3/27.
Which one is the correct answer if any? Appreciate some help.
You draw a marble from each bag what is the probability of drawing at least 2 blue marbles?
B W B *
B W W
B W R
B R B *
B R W
B R R
B B B *
B B W *
B B R *
W W B
W W W
W W R
W R B
W R W
W R R
W B B *
W B W
W B R
R W B
R W W
R W R
R R B
R R W
R R R
R B B *
R B W
R B R
So I marked down all of the possible outcomes and I get 7/27 but it doesn't make sense to me to include the same blue marbles twice because the third color is different
So that gives me 3/27.
Which one is the correct answer if any? Appreciate some help.
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
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06 Dec 2016, 12:50
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Hi benchic,
This is clearly a probability question, but it is missing some vital information:
1) How many bags are there?
2) How many of each color marble are in each bag? Even if we don't have the exact number of marbles of each color, a ratio of the colors would suffice.
If you provide the missing information, then I'll be happy to assist.
GMAT assassins aren't born, they're made,
Rich
This is clearly a probability question, but it is missing some vital information:
1) How many bags are there?
2) How many of each color marble are in each bag? Even if we don't have the exact number of marbles of each color, a ratio of the colors would suffice.
If you provide the missing information, then I'll be happy to assist.
GMAT assassins aren't born, they're made,
Rich
06 Dec 2016, 19:57
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Hi,
I believe you are talking of 3 bags having one each of w,r,and b....
At least 2 b means...
1) all 3 b...
Only one way.. b,b,b
2) 2b..
Choose two bags out of 3, which will contain b..
3C2= 3 ways but the third one can be either r or w, so 3*2=6 ways..
So total 7
Total ways=3*3*3=27..
Ans 7/27..
So as for your Q, yes babe will be different from bbr..
Your calculations of 27 contains both bbw and bbr as different ways , so they both have to be calculated as separate in possible cases thus 7
I believe you are talking of 3 bags having one each of w,r,and b....
At least 2 b means...
1) all 3 b...
Only one way.. b,b,b
2) 2b..
Choose two bags out of 3, which will contain b..
3C2= 3 ways but the third one can be either r or w, so 3*2=6 ways..
So total 7
Total ways=3*3*3=27..
Ans 7/27..
So as for your Q, yes babe will be different from bbr..
Your calculations of 27 contains both bbw and bbr as different ways , so they both have to be calculated as separate in possible cases thus 7
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
