As.1997
Badges: 16
Rep:
?
#1
Report Thread starter 1 month ago
#1
Please refer to the attachment.

I don't get why the answer is A.
If a white counter is already taken then it leaves 1W+2B.
Therefore, the probability of getting a white on the second attempt is 1/3 since only 1 white out of 3?
Attached files
Last edited by As.1997; 1 month ago
0
reply
aura3
Badges: 5
Rep:
?
#2
Report 1 month ago
#2
(Original post by As.1997)
Please refer to the attachment.

I don't get why the answer is A.
If a white counter is already taken then it leaves 1W+2B.
Therefore, the probability of getting a white on the second attempt is 1/3 since only 1 white out of 3?
This might help: https://www.thestudentroom.co.uk/sho....php?t=5437900
1
reply
mqb2766
Badges: 19
Rep:
?
#3
Report 1 month ago
#3
(Original post by As.1997)
Please refer to the attachment.

I don't get why the answer is A.
If a white counter is already taken then it leaves 1W+2B.
Therefore, the probability of getting a white on the second attempt is 1/3 since only 1 white out of 3?
Heres a famous variant of the problem
https://en.wikipedia.org/wiki/Monty_...012%20%3D%2016.
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

How would you feel if uni students needed to be double vaccinated to start in Autumn?

I'd feel reassured about my own health (30)
15.79%
I'd feel reassured my learning may be less disrupted by isolations/lockdowns (60)
31.58%
I'd feel less anxious about being around large groups (22)
11.58%
I don't mind if others are vaccinated or not (16)
8.42%
I'm concerned it may disadvantage some students (10)
5.26%
I think it's an unfair expectation (49)
25.79%
Something else (tell us in the thread) (3)
1.58%

Watched Threads

View All