1 Answers

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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