Trivia

Hard

In Your Average School Class There Is A 50% Chance Two People Share What?

Great-Great-Great Cousins
A Birthday
Ear Wax Type
Blood Type
A graph depicting Birthday Paradox calculations.
Rajkiran g/Wikimedia

Answer: A Birthday

In the field of probability theory, there is a problem known as the Birthday Paradox concerning the probability that in a selection of N randomly chosen people, some of them will share a birthday. This probability reaches 100 percent once you reach a sample size of 367 people (to account for the 366 potential days, including Feb. 29th, +1).

What’s fascinating, however, is how quickly the probability of sharing a birthday climbs. In a group of 23 people, around the size of a small class, the chances of two people sharing a birthday have already climbed to 50 percent. To get to 99 percent, you’d just need to gather two classrooms together. In a group of 57 people, there is a 99 percent chance that there is a common birthday.

While this might seem like something of a mathematical parlor trick, the math behind the Birthday Paradox has actually been successfully employed as a well known cryptographic attack, the Birthday Attack, which uses probabilistic modeling to reduce the complexity of cracking encryption hash functions.

Trivia

Easy

The Longest Running Scientific Experiment Centers Around What?

Trivia

Very Hard

For Centuries Wine Was Flavored With What Toxic Compound?

Trivia

Hard

What Was The First Rover To Land On A Celestial Body?

Trivia

Hard

The Largest Terrestrial Biome On Earth Is The?

Trivia

Easy

Which Simpsons Character Was Originally Intended As Homer’s Secret Identity?

Trivia

Easy

Which Product Name Is A Clever Anagram Of What They Supply?

Trivia

Hard

The Code Name For Microsoft Encarta Was?

Trivia

Very Hard

Which Empire Ruled Over The Largest Percentage Of Earth’s Population?

Trivia

Hard

The Ubiquitous Black Pens Found At Post Office Buildings Are Manufactured By?

Trivia

Hard

Which Of These Sweet Treats Was Originally Made From Sap?