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The Birthday Paradox — Most People Get This Wrong 🎂
MATH QUIZ: How many people do you need in a room for a 50%+ chance that two share the same birthday?
Most people say: 183 (half of 365).
The real answer: just 23.
Why? With 23 people, there are 253 possible pairs. Each pair has a 1/365 chance of matching. The probability that NO pair matches drops to ~49% — so a match is more likely than not.
This is the Birthday Paradox — one of the most surprising results in probability theory.
We teach probability theory at CyberMath Academy · Harvard Faculty Club · Boston, July 20–31, 2026.
🔗 cybermath.org
#BirthdayParadox #Probability #MathQuiz #MathFacts #CyberMathAcademy #HarvardMath #MathProblem #CounterIntuitive #MathForKids #SummerMath
Видео The Birthday Paradox — Most People Get This Wrong 🎂 канала CyberMath Academy
Most people say: 183 (half of 365).
The real answer: just 23.
Why? With 23 people, there are 253 possible pairs. Each pair has a 1/365 chance of matching. The probability that NO pair matches drops to ~49% — so a match is more likely than not.
This is the Birthday Paradox — one of the most surprising results in probability theory.
We teach probability theory at CyberMath Academy · Harvard Faculty Club · Boston, July 20–31, 2026.
🔗 cybermath.org
#BirthdayParadox #Probability #MathQuiz #MathFacts #CyberMathAcademy #HarvardMath #MathProblem #CounterIntuitive #MathForKids #SummerMath
Видео The Birthday Paradox — Most People Get This Wrong 🎂 канала CyberMath Academy
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25 мая 2026 г. 2:00:21
00:00:15
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