Mathematics 4024 · O Level · Probability of combined events

Probability of combined events — practice question

Bag A has 3 black and 2 white beads. Bag B has 2 black and 4 white beads. A bead is selected at random from Bag A and put into Bag B. Then a bead is selected at random from Bag B.
(a)[2]

Complete the tree diagram by filling in the missing values.

(b)[2]

Find the probability that a black bead is drawn from Bag B.

Worked solution & mark scheme

This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “$\frac{4}{7}$” …

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