A drawer contains black socks and white socks.
The ratio of black socks to white socks is 2:12:12:1.
Two socks are taken at random from the drawer.
The probability that both socks are white is 112\displaystyle \frac{1}{12}121.
Calculate the total number of socks in the drawer before any were removed.
Practise OCR GCSE Maths Probability Equation Questions with exam-style questions for Foundation and Higher tier. 28 questions, matched to the OCR GCSE Maths (J560) specification and written in the written papers 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.