perplexus.info :: Just Math : 8 eights, 8 ones

8 eights, 8 ones (Posted on 2019-10-01)

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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re solution .... partial spoiler !

| Comment 2 of 4 |

The digit not used is 2 - forgot to mention it in the off. solution.

Posted by Ady TZIDON on 2019-10-18 09:28:51

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