There are 4 green marbles and x x\,x yellow marbles in a bag.
2 marbles are removed from the bag at random.
The probability that both marbles taken are green is 215\displaystyle \frac{2}{15}152.
Work out the value of xxx.
43 exam-style questions on WJEC GCSE Maths Probability Equation Questions. Each one has a worked solution and a mark scheme showing where the marks go.