Combinations? Permutations? Those words don't mean what you think they mean

Only joking. You are all very clever

Hello, wrong number At the heart of machine learning are patterns, and patterns are all about counting, so it's important to make sure we are counting the correct items in the correct way. Combinatorics is the branch of mathematics concerned with counting things; more specifically, all the wonderful ways you can count, arrange and manipulate finite (limited in size) sets of things. Having a grasp of basic combinatorics is vital because it underlies many wide and varied real-world situations."