Maths on a Mug 5

Last nights Powerball lottery in the US was an incredible $1.5 bn! But what were the odds of winning?

You need to get 5 numbers from a pot of 69 in the main draw, and then one ‘bonus’ ball, from a pot of 26. So the odds are 69 choose 5 multiplied by 26, which gives you the equation on the mug.