perplexus.info :: Probability : Playing With Marbles

Playing With Marbles (Posted on 2003-10-13)

You choose one of two identical looking bags at random. One bag has three black marbles and one white marble. The other has three white marbles and one black marble.

After choosing a bag you draw one marble out at random. You notice it is black. You then put it back and draw another marble out of the same bag at random.

What is the probability that the second marble drawn is black?

See The Solution Submitted by Ravi Raja

Rating: 3.1000 (10 votes)

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
Puzzle Answer	K Sengupta	2022-07-06 23:27:43
Seven words	ajosin	2005-06-20 03:05:41
Some Infor	gabbo	2004-09-15 22:11:19
a possible answer	logischer Verstand	2004-03-21 23:37:55
Figuring out loud.	PhatFingers	2003-11-09 23:29:35
Solution	Prab	2003-11-05 09:07:55
the solution	anand	2003-10-17 14:38:05
re: no expert	Dan	2003-10-14 19:40:29
re: no expert	Charlie	2003-10-14 10:42:40
re: Extension to the problem	Charlie	2003-10-14 10:37:33
Extension to the problem	Trevor Leitch	2003-10-14 07:16:15
no expert	nellie	2003-10-14 07:05:04
Marble not at this......	Dan	2003-10-14 03:02:45
marble madness	Lee	2003-10-14 01:40:40
re(4): Have you lost your marbles ?	Dan	2003-10-14 00:47:26
re(3): Have you lost your marbles ?	DJ	2003-10-13 22:57:12
re(2): Have you lost your marbles ?	Dan	2003-10-13 21:15:50
re: Have you lost your marbles ?	Brian Smith	2003-10-13 21:04:14
Have you lost your marbles ?	Dan	2003-10-13 20:43:39
re: Could be wrong	DJ	2003-10-13 16:00:08
Solution	DJ	2003-10-13 15:55:18
Could be wrong	nikki	2003-10-13 15:47:36
Solution	Trevor Leitch	2003-10-13 15:25:11

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