Facing Marilyse...
Marilyse Legahuana has 3 coins, one with two 'tails' faces, one with two 'heads' faces,
and a usual 'heads/tails' one. She take one of these coins from her pocket and put it down onto the ground.
Aha, tails.
Question : what is the probability that the other face is heads ?
(Thanks to E.C. !)
Answer
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