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8 eights, 8 ones (Posted on 2019-10-01) Difficulty: 3 of 5
The unordered set S=(1818, 8811, 1881, 1818) represents 4 distinct decimal numbers: A, B, A+B, A-B.
All "8"s denote the same digit while each "1" stands for a different digit, distinct from all the others .

What digit is not used in S ?

See The Solution Submitted by Ady TZIDON    
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  Subject Author Date
Hints/Tips re solution .... partial spoiler !Ady TZIDON2019-10-18 09:28:51
Solutioncomputer solutionCharlie2019-10-01 15:44:37
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