Two marbles are drawn without replacement from a box with 3 white, 2 green, 2 red, and 1 blue marble. Find the probability. The second marble is white given the first marble is blue.
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Question

Two marbles are drawn without replacement from a box with 3 white, 2 green, 2 red, and 1 blue marble. Find the probability. The second marble is white given the first marble is blue. 
 A. 
  
 
 B. 
  
 
 C. 
  
 
 D.

anonymous · Answer

at first you have seven marbles. once one is selected you have 6 in the bag. of those 6, 3 are white
your probability is $\frac{3}{6}=\frac{1}{2}$