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You are given that n!(n−x)!=n \dfrac{n!}{(n-x)!} = n (n−x)!n!=n
Find xxx.
Bonus: Can you also find one exception for the above formula?
Notation: !!! denotes the factorial notation. For example, 8!=1×2×3×⋯×88! = 1\times2\times3\times\cdots\times8 8!=1×2×3×⋯×8.
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