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Find the probability that exactly 3 of the sweets chosen are red.
Mathematics 9709 · AS & A Level · The Poisson distribution
The Poisson distribution — practice question
A bottle holds 13 red sweets, 13 blue sweets, 13 green sweets and 13 yellow sweets. 7 sweets are chosen at random.
Worked solution & mark scheme
This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Using combinations, with an attempt to evaluate a product of 2 in the numerator and 1 in the denominator, for example $\frac{^{13}C_3\times{}^{39}C_4}{^{52}C_7}$” …
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