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Sunday Times Teaser 2938 – Numerophobia

by Danny Roth

Published January 13 2019 (link)

In Letterland there are no numerals. They use the decimal system of counting just like we do but the digits 0-9 are represented by the first ten letters of the alphabet A-J inclusive but in no particular order. The following calculations are typical:

(1) A + G = C

(2) B x J = FH

(3) GE x AI = HDB

What number is represented by ABCDEFGHIJ?

2 Comments Leave one →
  1. Brian Gladman permalink

    A straightforward permutation based solution can be written in a few minutes and runs in less than a second:

    but a little bit of work gives a solution that runs in 4 milliseconds on my Skylake laptop:

  2. geoffrounce permalink

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