I am stuck at this question. I came out with $\frac{8!}{3!\cdot2!}$, but the answer isn't correct. Thanks!
2026-04-08 11:10:38.1775646638
How many arrangements of the letters in the word CANADIAN do not contain a double N?
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I think it should be $$\frac{8!}{3!2!}-\frac{7!}{3!}$$