Cryptic Math Problem 21 AnswerHow do you tell when you run out of invisible ink?
spc Bd 1 Bd 3
 
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Cryptic Math Problem 21 Answer

Try to solve these cryptic math problems.

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Try to solve these cryptic math problems.
DOS
x DOS
CUATRO

 

Solution

564
x 564
318096

 

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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