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July 15th, 2011, 06:55 PM  #1 
Senior Member Joined: Jul 2011 Posts: 405 Thanks: 16  probability
A bag contains balls and it is not known that how many of these are white. balls are drawn and they are found to be white. What is the probability that all the balls in the bag were white? 
July 15th, 2011, 07:26 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,969 Thanks: 2219 
Some additional information is needed to calculate this probability.

July 15th, 2011, 08:15 PM  #3  
Math Team Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 408  Re: probability Hello, panky! Quote:
Two balls are drawn from rive balls. [color=beige] .[/color][color=blue][A][/color] Since two White balls were drawn, the bag contains at least two Whites. There are four equally likely cases for the contents of the bag: [color=beige]. . [/color][1] 2 Whites, 3 Blacks [color=beige]. . [/color][2] 3 Whites, 2 Blacks [color=beige]. . [/color][3] 4 Whites, 1 Black [color=beige]. . [/color][5] 5 Whites [1] 2 Whites, 3 Blacks [color=beige]. . [/color] [2] 3 Whites, 2 Blacks [color=beige]. . [/color] [3] 4 Whites, 1 Black [color=beige]. . [/color] [4] 5 Whites [color=beige]. . [/color] [color=beige] .[/color][color=blue][B][/color] [color=beige] .[/color][color=blue][C][/color] Substitute [color=blue][B][/color] and [color=blue][C][/color] into [color=blue][A}[/color]: [color=beige]. . [/color]  
July 18th, 2011, 07:05 PM  #4 
Senior Member Joined: Jul 2011 Posts: 405 Thanks: 16  Re: probability
thanks soroban


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