Are any of these choices correct?

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The discussion centers on the incorrectness of a claim regarding the total value of 12 coins. It highlights that the total of 69 cents limits the mean value of the coins to approximately 5.7 cents. Participants emphasize that any assertion of a higher mean is fundamentally flawed. The argument reinforces the importance of accurate calculations in discussions about coin values. Accurate mathematical reasoning is crucial to avoid misunderstandings in such topics.
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Those are non-sense! He pulled out 12 coins totaling only 69 cents. The mean cannot be more than that! (In fact, the mean is about 5.7 cents.)
 

Thread 'Two interesting number theory tricks'

First trick I learned this one a long time ago and have used it to entertain and amuse young kids. Ask your friend to write down a three-digit number without showing it to you. Then ask him or her to rearrange the digits to form a new three-digit number. After that, write whichever is the larger number above the other number, and then subtract the smaller from the larger, making sure that you don't see any of the numbers. Then ask the young "victim" to tell you any two of the digits of the...
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