Question 1
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?
