(i)[2]
In how many distinct ways can the 9 letters in the word CORRIDORS be arranged?
(ii)[3]
In how many distinct arrangements of the 9 letters in CORRIDORS is the first letter D and the last letter either R or O?
Mathematics 9709 · AS & A Level · Sampling and estimation
Sampling and estimation — practice question
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Correct counting method used, for example $\frac{9!}{2!\,3!}$ (or equivalent)” …
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