A bag contains four marbles, colored red, green, blue, and yellow (r, g, b, y).  You draw a marble out of the bag and then another one, without replacement. In every step, all marbles in the bag are equally likely to be drawn.  What is the probability that you get the blue marble (either with the first or the second draw)?  Make sure to draw the tree diagram with all 12 leaves.  1/4 2/3

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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A bag contains four marbles, colored red, green, blue, and yellow (r, g, b, y). 
You draw a marble out of the bag and then another one, without replacement. In every step, all marbles in the bag are equally likely to be drawn. 
What is the probability that you get the blue marble (either with the first or the second draw)? 
Make sure to draw the tree diagram with all 12 leaves. 

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