Alice wrote a 2-digit number on a piece of paper and asked Bobby to guess it.
Bobby asked: “Is the number 68?”
Alice replied: “One of the digits is correct, the position of that digit is wrong.”
Bobby asked again: “Is the number 17?”
Alice replied: “One of the digits is correct, the position of that digit is wrong.”
Bobby asked again: “Is the number 79?”
Alice said: “One of the digits is correct, the position of that digit is correct.”
What is the number written by Alice?
(digit number: Số có 2 chữ số; Digit: Chữ số; Number: Số; The position of that digit: Vị trí của chữ số đó; Correct: Đúng; Wrong: Sai.)