Mathematics 9709 · AS & A Level · Sampling and estimation

Sampling and estimation — practice question

(i)[2]

In how many distinct ways can the 11 letters in MISSISSIPPI be arranged?

(ii)[3]

Two letters are picked at random from the 11 letters in MISSISSIPPI. Find the probability that the two letters match.

Worked solution & mark scheme

This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: Applies permutations and combinations to work out $\dfrac{11!}{4!4!2!}$, or a correct equivalent form

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