RIDDLE - Katy´s new house

         Katy's new house number has three digits. When she challenged her friends to guess it, they tried: 135, 780, 785, and 732.
        "That's amazing," Katy said. "You've each guessed exactly one digit correctly and in its right place!"
        What is Katy's house number?

HINT: The fact that three guesses began with a 7 will give you a good start.




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