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0

Another way:


3

Frequency approach


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The same answer as El-Guest, but with a different approach: Exactly the same reasonning proves that: As a consequence Finally, the unique solution is:


4

By logical deduction without guessing: From clues 1 and 2: Clue 3: So we now have: Clue #4:


4

Hints: 3548 - 2 correct digits, but only 1 in the right place 4860 - 1 correct digit, but in the wrong place 2356 - 3 correct digits, but only 1 in the right place 2584 - 2 correct digits and in their place One possible number is therefore


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