Probability Intuition Test
A free test of your gut feel for probability, built on classic puzzles like Monty Hall and the birthday paradox. Answer 10 questions and see how close your instinct was.
Built & reviewed by Ankit Madia
What This Probability Test Does
Human intuition is surprisingly poor at judging odds. This test gathers 10 of the most famous probability puzzles, the ones that regularly fool even smart, numerate people, and lets you back your gut against the real answer. After each question you see the true probability and the simple reasoning behind it.
Puzzles You Will Meet
- The Monty Hall problem: should you switch doors?
- The birthday paradox: how few people before two share a birthday?
- False positives: why a positive test for a rare disease often means little.
- The gambler's fallacy: whether a coin is ever 'due'.
- Regression to the mean: why a great result is usually followed by an ordinary one.
- The conjunction fallacy: why more detail feels more likely but never is.
Why It Matters
A weak sense of probability quietly costs money. It is behind lottery tickets, hot-hand betting, panic over rare risks, and misreading medical tests. Getting a feel for how odds really behave helps you stay calm and rational when numbers and chance are involved.
An Honest Note
This is a short, for-fun quiz built on well-known puzzles. It is a fun way to sharpen your instinct for odds, not a formal test of ability, so enjoy the score and, more importantly, the explanations.