Coin Head and Tail

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?




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If someone is offering you a 2 to 1 odds that the numbers will be relatively prime, for example
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If the balls you picked had the numbers 5 and 25, you win $2.

Will you accept that bet?

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There were two grandmothers and their two granddaughters.
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There were two fathers and their two daughters.
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All are born legitimate and relationships clear.
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