- #1

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"You are moving to other apartment and you need to find your probability book. It is inside of one box. There are

**n**boxes to all. The probability of the book is inside of the

**box i**is

*Pi*and the probability of the book, being in the box i, to be found is

*Ai*. Then what's the conditional probability of the book is in the box j, given that you it looked in box i and did not find. It analyzes the cases where

*i é igual ao j*and

*i é diferente do j*".