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the answer to the first question is – 1/3 + 1/3*1/2 = 1/2
the answer to the second question require the formula of conditional probability. Let’s say:
P(A) – probability that second stall is occupied
P(B) – probability that the first stall is occupied
P(A\B) = P(AandB) / P(B)
P(B) = 1/2 (first question)
P(AandB) = 1/3
P(A\B) = (1/3) / (1/2) = 2/3
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