# probability

It's so ubiquitous it's normal!

How long do you have to wait for more than one thing to happen?

They are incredibly useful, but what exactly are they?

How long do you have to wait for something to happen?

What's the chance that something happens?

Markov chains are exceptionally useful tools for calculating probabilities, and they might increase your chance of getting to the beach!

New episodes of Pointless, the addictive TV quiz show, return today! Celebrate with John Haigh and some fascinating Pointless maths!

Take a quick trip to the foundations of probability theory.

Randomness is surprisingly hard to define. Fortunately the mathematical language we use to describe it is beautifully well defined.

The second guiding principle in probability theory is more subtle – universality.

Symmetry is one of the two guiding principles in understanding probabilities – if different outcomes are equivalent they should have the same probability.

• Want facts and want them fast? Our Maths in a minute series explores key mathematical concepts in just a few words.