From bag A containing 4 black and 8 blue marbles, 6 marbles are transferred into an empty bag B. Three marbles are now drawn from bag B, and each of them happens to be black.

Determine the probability that a fourth marble drawn from bag B will be black, given that:

(I) The first three marbles are returned to bag B.

(II) None of the first three marbles is returned to bag B.

Probable Prime Poser | Rating: 1.00
Posted on 2010-01-19 by K Sengupta (No Solution Yet, 4 Comments)

Supreme Successive Shuffle |
Posted on 2009-12-15 by K Sengupta (No Solution Yet, 9 Comments)

3x3 Grid Near Magic |
Posted on 2009-12-05 by K Sengupta (No Solution Yet, 6 Comments)

sum of outcomes of three dice | Rating: 3.00
Posted on 2009-11-20 by Vishal Gupta (Solution Posted, 4 Comments)

Half a Circle, Half a Sphere | Rating: 3.00
Posted on 2009-10-28 by Brian Smith (No Solution Yet, 4 Comments)

Probable Ten Power | Rating: 4.00
Posted on 2009-10-06 by K Sengupta (No Solution Yet, 2 Comments)

Random +, - or / Random |
Posted on 2009-08-24 by Jer (No Solution Yet, 2 Comments)