logic
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Rock, Paper, Scissors
in PuzzlesAdam and Eve play rock-paper-scissors 10 times. You know that: Who wins? By how much? Riddle from: Popular Mechanics
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Two Doors
in PuzzlesYou wake up in an empty room with only 2 doors. Each door has a key-hole where you can peek through. Door A is guarded by a dragon that will incinerate anyone it sees. Door B is simply a hallway, with an odd ceiling, it’s the strongest magnifying glass on earth! It magnifies the sun…
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Super Lottery
in PuzzlesWhat are your odds of winning a 100 million person lottery with these rules? You are one of 100 million people playing in a lottery. On each drawing there is exactly one winner. What is the probability that you will win at least once before someone (could be any one of the other players) wins…
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100 Prisoners
in PuzzlesCan you help the prisoners communicate using just a light bulb? There are 100 prisoners about to serve solitary confinement. While imprisoned, no prisoner will have contact with any other prisoner – in fact, they will usually never leave their cells. However, each day the warden will pick a prisoner (either at random or arbitrarily)…
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2358 puzzle
in PuzzlesUsing 4 math operationsObtain 16 using 2,3,5,8.All numbers must be used.Each number must be used once.You can put parentheses anywhere.Those are numbers, not digits, for example you cannot combine 2 with 3 to make 23.