Paradoxes

Five probability puzzles that prove your intuition wrong — with live simulations to settle every one.

Start → Monty Hall

01Monty HallWhy switching doors wins twice as often🚪

02Birthday Paradox23 people, 50/50 odds of a shared birthday🎂

03Two EnvelopesThe switch that looks profitable but isn't✉️

04Sleeping BeautyIs it 1/2 or 1/3? Philosophers still argue😴

05Simpson's ParadoxWhen the parts and the whole disagree📊