# Probability Based on Random Selection

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There are three boxes, each with two drawers.

Box I has a gold coin in each drawer

Box II has a silver coin in each drawer

Box III has a gold coin in one drawer and a silver coin in the other.

One box is chosen at random and a drawer is opened from that box. If it contains a gold coin, find the probability that it is in Box I.

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#### Solution Preview

Solution. Denote the events that Box I, Box II and Box III are chosen by A, B and C, respectively. Then we know that ...

#### Solution Summary

Probabilities based on random selection are calculated. Some knowledge of probability theory may be required to understand the solution.

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