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A puzzle related to mathematical facts and objects, whose solution needs mathematical arguments. General mathematics questions are off-topic but can be asked on Mathematics Stack Exchange.

3 votes
Accepted

Carnival game of 15

Some hints I spotted:
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4 votes
Accepted

moving coin from place n,n-1,n-2 to smaller places until no one can move

As starting player we can always move one coin to field 1 in our first move. Thus effectively taking this coin out of the game, so we only have to consider the remaining two coins. But which one to mo …
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2 votes

Can you arrange ABCD...Z into a straight line so that consecutive letters of the alphabet ha...

TakingNotes is correct but thinking outside the box
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