In an interview for a banking job, a student was asked to calculate the following: A can

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In an interview for a banking job, a student was asked to calculate the following:

A can contains 20 coins, 19 of which are ordinary coins and 1 of which has heads on both sides. A coin is randomly selected from the can and flipped five times. It lands heads all five times. What is the probability that it is the two-headed coin?

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