# probability

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?

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.