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Is it true that we can get zero for all $(x,y,z)\in\mathbb{N}^3$?

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#puzzle #combinatorial-game-theory
1.2k
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How do you calculate 45 min without any clock and sense of time?

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#puzzle
518
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Is every shape possible with a snake?

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#puzzle #combinatorial-geometry
187
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Explaining a Pattern in a Matrix Generated by Minimum Excluded Number in Rows & Columns

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#matrices #recreational-mathematics #puzzle #combinatorial-game-theory
6.1k
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A puzzle about a sum and product of two numbers

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#elementary-number-theory #puzzle
50
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A limited composition of two unlimited functions on natural numbers?

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#elementary-number-theory #functions #puzzle
564
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Puzzle - Finding which balls are heavy

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#puzzle
129
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Counting length of pyramid's sides puzzle

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#puzzle
1.5k
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Hank and his old car

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#recreational-mathematics #puzzle
7.3k
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"The Bachelorette Problem" (slightly adapted from Tao's Google+ account)

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#recreational-mathematics #puzzle
501
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Are the odds one in a million?

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#probability #recreational-mathematics #puzzle
193
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The sum of $1+1+1+1+...$

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#summation #puzzle #infinity
660
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Shortest possible unreachable shape

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#geometry #puzzle
475
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logical problem (how long did you walk?)

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#recreational-mathematics #puzzle
147
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Prove a length of 6 in a triangle diagram.

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#geometry #triangles #puzzle

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