perplexus.info :: Probability : Four balls

Four balls (Posted on 2017-05-19)

There are four balls in a hat: a blue one, a white one, and two red ones. Now I draw simultaneously two balls, look at them, and announce that at least one of them is red.

What is the chance that the other is red as well?

See The Solution Submitted by Ady TZIDON

Rating: 3.5000 (2 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)

re(2): Who's right?.......I AM.

| Comment 10 of 22 |

(In reply to re: Who's right? by broll)

Only the 1st reasoning holds water.

I'm too tired now to post a comprehensive answer, maybe late to-night or to-morrow evening.

Meanwhile - address the card deck!

Posted by Ady TZIDON on 2017-05-20 09:38:02

Please log in:

Login:
Password:
Remember me:

Sign up! \| Forgot password

Search:

Search body:

Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (3)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:


perplexus dot info