|
|
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.
Updated on: 22 Jun 2025, 10:48
Originally posted by CareerGeek on 08 Nov 2019, 03:08.
Last edited by Bunuel on 22 Jun 2025, 10:48, edited 2 times in total.
Last edited by Bunuel on 22 Jun 2025, 10:48, edited 2 times in total.
Kudos
Bookmarks
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
68% (02:11) correct
32%
(02:16)
wrong
based on 133
sessions
History
Date
Time
Result
Not Attempted Yet
A bag contains 4 white balls and 5 blue balls and a second bag contains 2 white balls and 4 blue balls. A ball is picked from first bag and placed in the second bag and a ball is then picked from second bag. What is the probability that ball picked from second bag is a blue ball ?
A. 2/3
B. 3/7
C. 26/63
D. 37/63
E. None of these
A. 2/3
B. 3/7
C. 26/63
D. 37/63
E. None of these
08 Nov 2019, 03:30
Kudos
Bookmarks
Dillesh4096
When we pick up the ball from the first bag, what matters to us is whether it is blue..
(I) If it is blue... Probability = 5/9
Second bag now contains 2 W and 4+1 B, so probability of B is 5/7..
Probability that B is picked from 1st bag and then B is picked from 2nd bag = 5/9*5/7=25/63
(II) If it is NOT blue... Probability = 4/9
Second bag now contains 2+1 W and 4 B, so probability of B is 4/7..
Probability that B is NOT picked from 1st bag and then B is picked from 2nd bag = 4/9*4/7=16/63
Total P = 25/63+16/63=41/63
E
General Discussion
ShankSouljaBoi
Joined: 21 Jun 2017
Last visit: 28 Mar 2026
Posts: 599
Own Kudos:
Given Kudos: 4,090
Location: India
Concentration: Finance, Economics
Schools: Rotman '23 (D) IIMA PGPX'22 (D) Desautels '23 (D) Schulich Sept '23 (D) WBS (D) IIML IPMX'25 (A)
GMAT 1: 660 Q49 V31
GMAT 2: 620 Q47 V30
GMAT 3: 650 Q48 V31
GPA: 3.1
WE:Corporate Finance (Non-Profit and Government)
Products:
Schools: Rotman '23 (D) IIMA PGPX'22 (D) Desautels '23 (D) Schulich Sept '23 (D) WBS (D) IIML IPMX'25 (A)
GMAT 3: 650 Q48 V31
Posts: 599
Kudos:
611
08 Nov 2019, 03:33
Kudos
Bookmarks
25/63 + 16/63 = 41/63 = E
Seen this question somewhere
Posted from my mobile device
Seen this question somewhere
Posted from my mobile device
