There are some black socks and some white socks in a drawer.
The ratio of black socks to white socks is 2:12:12:1.
Two socks are removed at random from the drawer without replacement.
The probability that both socks are black is 37\displaystyle \frac{3}{7}73.
Work out how many white socks are in the drawer.
Practise Edexcel GCSE Maths Probability Equation Questions with exam-style questions for Foundation and Higher tier. 28 questions, matched to the Edexcel GCSE Maths (1MA1) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.