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19!=12164510a4a8832000‾\large 19! = \overline{12164510{\color{#3D99F6}a}4{\color{#3D99F6}a}8832000} 19!=12164510a4a8832000
Determine the digit a{\color{#3D99F6}a}a.
Note: 19!=19×18×17×⋯×2×1 19 ! = 19 \times 18 \times 17 \times \cdots \times 2 \times 1 19!=19×18×17×⋯×2×1
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