A box contains six (6) red balls, nine (9) white balls, and five (5) blue balls. A ball is selected and then replaced. Then, a second ball is selected.
1. the first ball is yellow and the second blue
2. neither ball is blue
P (white,white) =9/20*9/20 = 81/400 = 0.2025
P(red,white) = 6/20 *9/20 = 54/400 = 0.135
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