BRAIN TRIVIA
Code breakers: find the correct 4-digit combination using the numbers 1-9, with no repeats:
4 2 3 5 - 1 digit is correct and in the correct position
8 1 7 6 - 2 digits are correct but in the wrong positions
2 7 5 1 - None of the digits are correct
4 3 2 7 - 1 digit is correct but in the wrong position
6 1 2 8 - 2 digits are correct and in the correct positions
Explanation:
Code breakers: find the correct 4-digit combination using the numbers 1-9, with no repeats:
4 2 3 5 - 1 digit is correct and in the correct position
8 1 7 6 - 2 digits are correct but in the wrong positions
2 7 5 1 - None of the digits are correct
4 3 2 7 - 1 digit is correct but in the wrong position
6 1 2 8 - 2 digits are correct and in the correct positions
From clue 3, you can remove those numbers from all of the other clues. This leaves us with:
4
235- 1 digit is correct and in the correct position8
1 76 - 2 digits are correct but in the wrong positions2 7 5 1- None of the digits are correct4 3
2 7- 1 digit is correct but in the wrong position6
1 28 - 2 digits are correct and in the correct positions
From clues 2 and 5, 6 must be the first digit and 8 must be the last digit.
From clues 1 and 4, 3 must be the correct digit in the third spot.
If the final (second) digit cannot be 1, 2, 5, or 7 (from clue 3), or 3, 6, or 8 (because no digits are repeated), and it can’t be 4 (from clues 1 and 4), the second digit must be 9.
Solution:
6 9 3 8