There are some green beads and some yellow beads in a bag.
The ratio of green beads to yellow beads is 3:13:13:1.
Two beads are removed at random without replacement.
The probability that both beads taken are green is 1120\displaystyle \frac{11}{20}2011.
Work out how many yellow beads are in the bag.
43 exam-style questions on CCEA GCSE Maths Probability Equation Questions. Each one has a worked solution and a mark scheme showing where the marks go.