Browse Teasers
Search Teasers

## Secret Santas I

Probability puzzles require you to weigh all the possibilities and pick the most likely outcome.

 Puzzle ID: #43847 Fun: (2.23) Difficulty: (2.96) Category: Probability Submitted By: javaguru

A group of about twenty friends decide to exchange gifts as secret Santas. Each person writes their name on a piece of paper and puts it in a hat and then each person randomly draws a name from the hat to determine who has them as their secret Santa.

What is the probability that at least one person draws their own name?

### Hint

The probability converges on a single value as the number of people approaches infinity. At ten people the probability is accurate to better than 1 millionth for any number more than ten people.
Hide

## What Next?

See another brain teaser just like this one...

Or, just get a random brain teaser

If you become a registered user you can vote on this brain teaser, keep track of
which ones you have seen, and even make your own.