Since 2nd digit is quadruple the 3rd digit, then the 3rd digit MUST BE 1 or 2



Let 3rd digit = 1

2nd digit = 4(1), or 4

1st digit = 4 - 3, or 1

Since it APPEARS as though the 3 digits are distinct, the 3rd and 1st digits can't be 1 



Let 3rd digit = 2

2nd digit = 4(2), or 8

1st digit = 8 - 3, or 5

These appear to be the 3 digits, in order:  

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