All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Probability
Simpler probability problem? (Posted on 2015-08-11) Difficulty: 1 of 5
An urn contains 5 black and 20 white marbles. They are to be drawn one at a time until all of one color has been exhausted.

What is the probability that the color of the first draw correctly predicts the first color exhausted?

No Solution Yet Submitted by Jer    
No Rating

Comments: ( Back to comment list | You must be logged in to post comments.)
re: re. difficulty level | Comment 6 of 14 |
(In reply to re. difficulty level by Ady TZIDON)

Difficulty level is rather a subjective matter. I've noted in the past that the D-levels you usually assign are lower than what I'd consider appropriate, most recently "Clever Counting". When voting I take this into consideration, and would never insist on a change of D level, first of all, as in the case of a D level I consider too low, there might be an insight I might not see.


In the case of the current puzzle, I knew there'd be a little consideration of the two cases, so maybe it could go to a D2, but nothing higher, especially considering some of the difficult (to me) puzzles you have insisted are no higher than D2.  At D1, therefore, the current puzzle is only one D-level off (for me).

It may be that I just have more of an affinity for probability puzzles. Your area might be different.  That's whay haggling over difficulty levels isn't worth the time involved, unless, say we suspect (which is most often the case the case of a "wrong" difficulty level) that the author has merely left the default difficulty of 3, and it's clearly much higher or lower. Even then, a comment is sufficient rather than withholding a vote.

  Posted by Charlie on 2015-08-12 08:57:18
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 (4)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2017 by Animus Pactum Consulting. All rights reserved. Privacy Information