In a bag there are only red counters, blue counters and white counters
number of red counters : number of blue counters : number of white counters=5:4:3 \text{number of red counters : number of blue counters : number of white counters} = 5 : 4 : 3 number of red counters : number of blue counters : number of white counters=5:4:3A counter is taken at random from the bag.
Verify that the probability of the counter being red is 512\displaystyle \frac{5}{12}125, the probability of the counter being blue is 13\displaystyle \frac{1}{3}31 and the probability of the counter being white is 14\displaystyle \frac{1}{4}41.
324 exam-style questions on AQA GCSE Maths Probability. Each one has a worked solution and a mark scheme showing where the marks go.