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Four candle problem: Using candles as timers

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#puzzle #recreational-mathematics #fractions
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How many fours are needed to represent numbers up to $N$?

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#combinatorics #discrete-mathematics #asymptotics #recreational-mathematics #puzzle
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Upper bound on minimum number of moves to solve the $m\times n$ sliding puzzle

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#combinatorics #puzzle
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Talks using just two words, such that the same thing is never said three times in a row

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#puzzle
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Puzzle - where did the extra dollar come from?

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#puzzle
240
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Optimal polyomino induced coloring

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#combinatorics #puzzle #recreational-mathematics #tiling
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Dot on forehead riddle

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#recreational-mathematics #puzzle
109
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Is there a use for this technique?

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#algorithms #soft-question #puzzle
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Puzzle - 123456789 = 100 with three operations?

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#puzzle
210
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How to express $2012$ in terms of three consecutive primes?

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#prime-numbers #puzzle
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100 Soldiers riddle

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#combinatorics #pigeonhole-principle #puzzle #inclusion-exclusion
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Coffee Break Riddle

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#recreational-mathematics #puzzle
255
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Two plants, a rose and a jasmine.....

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#puzzle
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Using forced perspective to estimate the distance or size of an object

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#geometry #puzzle
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Strategy / calculus riddle

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#problem-solving #puzzle

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