# STEP Support - Assignment 5

### Introduction

This STEP Support module involves some trigonometry and a question about a tetrahedron (and a question about socks!). Previous assignments can be found here, but you can do this one without having done the others first.

STEP questions are difficult, they are supposed to be and you should expect to get stuck. However, as you tackle more and more STEP questions you will develop a range of problem solving skills (and spend less time "being stuck").

The final question is about finding out how many socks you need to remove from a drawer in order to get a matching pair, two matching pairs and $n$ matching pairs. You need to fully justify your answer for n pairs rather than just extrapolating from the previous results.