Mathematics 4024 · O Level · Probability of combined events

Probability of combined events — practice question

The box has $13$ pencils in total. Among them, $4$ are red, $7$ are green and $2$ are yellow. Two pencils are then selected at random from the box without replacement.
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Work out the probability that the two pencils are of different colours.

Worked solution & mark scheme

This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “The probability is $\frac{100}{156}$.” …

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