|
|
GMAT 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.
21 Apr 2025, 00:30
Kudos
Bookmarks
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
72% (01:46) correct
28%
(01:53)
wrong
based on 81
sessions
History
Date
Time
Result
Not Attempted Yet
Tracy has 3 bags of marbles, each bag containing at least 1 blue marble, at least 1 red marble, and no marbles of another color. If Tracy selects 1 marble at random from each bag, what is the probability that all 3 marbles that she selects will be red?
(1) There is a total of 5 red marbles and 5 blue marbles in the 3 bags.
(2) The ratios of red to blue marbles in the 3 bags are 2: 1, 1: 1, and 1: 2.
(1) There is a total of 5 red marbles and 5 blue marbles in the 3 bags.
(2) The ratios of red to blue marbles in the 3 bags are 2: 1, 1: 1, and 1: 2.
21 Apr 2025, 01:58
Kudos
Bookmarks
3 bags: Each contains at least 1 red & 1 blue marble. That accounts for 6 marbles. No information on remaining marbles in the question.
Statement 1: Total is 10. No other information on the distribution. Hence we cannot calculate probability. Not sufficient. Hence options reduce to B, C or E
Statement 2: 1st bag: probability of red will be 2x/3x = 2/3
2nd bag: 1/2
3rd bag: 1/3
Probability= 2/3 x 1/2 x 1/3 = 1/9.
Hence sufficient. Option B.
Statement 1: Total is 10. No other information on the distribution. Hence we cannot calculate probability. Not sufficient. Hence options reduce to B, C or E
Statement 2: 1st bag: probability of red will be 2x/3x = 2/3
2nd bag: 1/2
3rd bag: 1/3
Probability= 2/3 x 1/2 x 1/3 = 1/9.
Hence sufficient. Option B.
21 Apr 2025, 12:17
Kudos
Bookmarks
Bunuel
There are three bags B1, B2, B3 and each bag has ATLEAST 1 red and 1 blue ball.
Probability when three balls are selected at random and all three are red .
Statement 1:
(1) There is a total of 5 red marbles and 5 blue marbles in the 3 bags.
this says about B3, and no information is provided about B2 and B1. Hence, Insufficient.
Options A,D eliminated.
Statement 2:
(2) The ratios of red to blue marbles in the 3 bags are 2: 1, 1: 1, and 1: 2.
This gives the ratio of red to blue balls in all the bags.
ignoring, the mathematical calculations behind. We can reasonably conclude that with these parameters, we can answer the question. Hence, Sufficient
Option B
