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1 2 3 4    C
5 6 7 8    C
   9 0 9 0    GG
              9 3 5 0    C C C C 

Clues :
The letter "G" means the number guessed has a correct digit and is in the correct place.
The letter "C" means one of the numbers is in the answer but the number is in the wrong place.

Question : What is the missing number?

See answer

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