Answer
$\{(R,R),(R,B),(R,Y),(B,R),(B,B),(B,Y),(Y,R),(Y,B),(Y,Y)\}$
Work Step by Step
The sample space/all possible outcomes for selecting the marbles are: $\{(R,R),(R,B),(R,Y),(B,R),(B,B),(B,Y),(Y,R),(Y,B),(Y,Y)\}$
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