Question 7
Alex the beaver has five chests labelled with codes, as shown below.
To open them, Alex has five keys labelled with numbers. Identical digits correspond to identical letters, and different digits correspond to different letters.
Unfortunately, the number on one key has disappeared. The picture shows the numbers on the four remaining keys.
Which of the following is the missing number?
To open them, Alex has five keys labelled with numbers. Identical digits correspond to identical letters, and different digits correspond to different letters.
Unfortunately, the number on one key has disappeared. The picture shows the numbers on the four remaining keys.
Which of the following is the missing number?