New divisibility rule! (30,000 of them)
37:23
The most ridiculously complicated maths card trick.
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The mathematically impossible ball that shouldn’t exist.
15:39
An amazing thing about 276 - Numberphile
42:08
Why it’s mathematically impossible to share fair
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Divisibility Rules
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The Bingo Paradox: 3× more likely to win
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Why does this balloon have -1 holes?
29:42