Home » Classic Riddles » What is the longest and yet the shortest thing in the world; the swiftest and yet the slowest; the most d...

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What nut has a hole and is squishy?

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missing number in the reasoning puzzle image 8, 7, 6, 9, 13, ?, 4, 9, 5

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I have three envelopes, into one of them I put a $20 note. I lay the envelopes out on a table in front of me and allow you to pick one envelope. You hold but do not open this envelope. I then take one of the envelopes from the table, demonstrate to you that it was empty, screw it up and throw it away. The question is would you rather stick with the envelope you have selected or exchange it for the one on the table. Why? What would be the expected value to you of the exchange?

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How can this be true? Have a look at the picture. All the lines are straight, the shapes that make up the top picture are the same as the ones in the bottom picture so where does the gap come from?

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