In each of the following, describe the sample space for the indicated experiment.

2 boys and 2 girls are in Room X, and 1 boy and 3 girls in Room Y. Specify the sample space for the experiment in which a room is selected and then a person.


Let X denote the event Room X is selected, Y denote the event Room Y is selected

B1,B2 denote the event a boy is selected from room X ,B3 denote the event a boy is selected from Room Y and G1,G2 denote the event a girl is selected from Room X andG3,G4,G5 denote the event a girl is selected among the three girls from Room Y


The problem is solved by dividing into two cases


Case 1: Room X is selected


We define the possible outcomes by an ordered set (x , y)


x denotes the event Room X is chosen


y denotes the second event a student is selected


Sample Space S1={(X,B1),(X,B2),(X,G1),(X,G2)}


Case 2: Room Y is selected


We define the possible outcomes by an ordered set (x , y)


x denotes the event Room Y is chosen


y denotes the second event a student is selected


Sample Space S2={(Y,B3),(Y,G3),(Y,G4),(Y,G5)}


The overall sample space


S={(X,B1),(X,B2),(X,G1),(X,G2),(Y,B3),(Y,G3),(Y,G4),(Y,G5)}


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