Hi

12 marbles in all , 3 of which are green

P(drawing one green) = 3/12 = 1/4

With replacement, each draw is from bag of 12 marbles, 3 of which are green

P(3 green marbles) = 1/4* 1/4 * 1/4 = (1/4)^3 = 1/64 

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