Question 186527
75 blue
44 red
21 white
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140 total number of marbles.
a) 44/140*43/139=.3143*.309=.097 or 9.1 % probability of selecting 2 red marbles.
b) 44/140*21/139*43/138*75/137
.314*.15*.312*.547=.0081 or .81 % probability of selecting a red, then a white, then another red, then a blue marble without replacement.