Question 1112875
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Let X be the event that a 2-bedroom apartment on the second floor was selected.


Consider the fact that P(X) + P(~X) = 1, hence P(~X) = 1 - P(X).


There is a one in three probability of selecting the second floor and there is a two in three probability of selecting a 2-bedroom apartment given that the second floor was selected, hence P(X) = 1/3 times 2/3 = 2/9.


Therefore: P(~X) = 7/9


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
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