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x!=11!+10!9! \large x! =\dfrac{11! + 10!}{9!} x!=9!11!+10!
Find the value of xxx satisfying the equation above.
Notation:
!!! denotes factorial. For example, 8!=1×2×3×⋯×88! = 1\times2\times3\times\cdots\times8 8!=1×2×3×⋯×8.
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