Mathematics 4024 · O Level · Probability of combined events
Probability of combined events — practice question
A bag has $10$ counters in total: $8$ are blue and $2$ are white. Two counters are chosen at random from the bag without replacement.
(a)[1]
Fill in the tree diagram so that it displays the outcomes that can occur and the matching probabilities.
(b(i))[1]
Determine, as a fraction, the probability that both counters are blue.
(b(ii))[2]
Determine, as a fraction, the probability that one counter is blue and the other is white.
Worked solution & mark scheme
This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “$\frac{2}{10}, \frac{2}{9}, \frac{8}{9}, \frac{1}{9}$ entered correctly” …