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Find the probability that exactly $3$ of them are green.
Mathematics 9709 · AS & A Level · The Poisson distribution
The Poisson distribution — practice question
A bag has $10$ pink balloons, $9$ yellow balloons, $12$ green balloons and $9$ white balloons. $7$ balloons are chosen at random without replacement.
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This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “By using combinations, for example $\dfrac{^{12}C_3\times{}^{28}C_4}{^{40}C_7}$, with an attempt to calculate the terms” …
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