<PRE><B>Question 1051519</B>
Yes-----5/8-----yes 4/7  20/56 ANSWER A.
-----------------no 3/7 15/56

No-----3/8-----yes 5/7 15/56
----------------no 2/7  6/56  ANSWER B.
That adds to 1.0
C 30/56, adding
D. 15/56.

Once you have the tree, you can read off the probabilities to get the answers to the questions.  With no replacement, the denominator must fall by one.  The numerator may fall or not depending upon whether it was selected the first time. In all instances, the probabilities for each draw must add to 1. The total probabilities for the draw must also add to 1.

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