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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Puzzle Answer

Comment 4 of 4 |

The missing digit in set S is 2.

I sincerely hope to posit an independent explanation of my own in the future.

Posted by K Sengupta on 2022-05-31 04:03:11

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