An urn contains 4 red, 7 white, and 9 black balls. One ball is drawn from the urn, it is replaced, and a second ball is drawn. Construct a probability tree to determine the probability that both balls are white W.
A) Pr(both W) = 
B) Pr(both W) = 
C) Pr(both W) = 
D) Pr(both W) = 
E) Pr(both W) = 
Correct Answer:
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