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2 năm trước
John wrote a 4-digit number on a piece of paper and asked Peter to guess it. Peter asked: “Is the number 2435?” John replied: “Two of the digits are correct. The positions of those digits are also correct.” Peter asked again: “Is the number 6397?” John replied: “Two of the digits are correct. The positions of those digits are all wrong.” Peter asked again: “Is the number 9823?” John said: “All the digits are correct. The positions of those digits are all wrong.” Given all the digits in that 4-digit number are all different, what is the number written by John?
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