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A bag contains four marbles: one red, one black, one white, and one orange.
Two marbles are to be selected at random from the bag, with replacement.
Sample Space: RR,BB,WW,OO, RB,BR,RW,WR,RO,OR,BW,WB,B0,OB, WO,OW
P(2B) = 1/4*1/4 = 1/16