042 is the correct answer.
Quick logic:
From 738: digits 7, 3, 8 are not in the code.
From 780: only 0 can be correct (since 7 and 8 aren’t), and it’s wrongly placed → 0 is not in position 3.
From 206: two digits are correct but wrongly placed. Since 0 is in the code and in “206” it’s in position 2, 0 is not position 2 either → so 0 must be position 1.
From 682: one digit correct and well placed. 8 isn’t allowed, and position 1 isn’t 6 (it’s 0), so 2 must be correct in position 3.
From 614: one digit correct but wrongly placed. 6 isn’t in the code; 1 can’t fit (would have to be not position 2 but only position 2 is open), so 4 is the digit and must be in position 2.
18
5
855
230,271





































