(a)[2]
Finish the tree diagram.
(b)[1]
Write down the probability that two black beads are selected.
Mathematics 4024 · O Level · Introduction to probability
Introduction to probability — practice question
There are exactly two white beads and one black bead in the bag. Two beads are then chosen at random without replacing them.
Worked solution & mark scheme
This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “A correct tree showing probabilities $\frac{2}{3},\frac{1}{2},1,0$” …
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