OK, so what's the speed of dark? 
Cryptic Math Problem 21 AnswerYou are looking at the answer to one of our Cryptic Math Puzzles. There are other puzzles to figure out. Please click to find all the Cryptic Math Puzzles.
Solution
Explanation DOS must be between 352 and 987 to generate a square with six different digits. Therefore, D can only be 3, 4, 5, 6, 7, 8 or 9. S can only be 2, 3, 4, 7, 8 or 9 with corresponding value for O of 4, 9, 6, 9, 4 and 1. This limits DOD to q few value which can be easily checked to arrive at the answer. Thanks to Penguin Dictionary of Curious and Interesting Numbers 

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