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Clue 4: 738 (All digits are wrong)

This means 7, 3, and 8 can’t be placed in the combination. Looking on to the other four combinations, we can spot 3 and 8 are present in the fifth clue. So, next, we will analyze the clue number five.

Clue 5: 380 (One digit is right but in the wrong place)

One digit is right and we know from clue four that 3 and 8 are wrong, this makes 0 as the right digit. But, it is placed in the wrong place, this means 0 can not be placed in third place and it can be present in the first or the second place.

Clue 3: 206 (Two digits are right but both are in the wrong place)

Out of 2, 0, and 6, we know from clue 5 that 0 is the right digit. Apart from 0, either 2 or 6 is right. This clue also states that the two right digits are at the wrong place. 0 is in the second place, this makes the second place as the wrong place of 0. And we know from clue five that 0 can not be placed in the third place. So, finally, we can say that 0 is placed in the first place. So, till this point, we have * 0??*.

Clue 1: 682 (One digit is right and in its place)

From this clue we can decide if 6 is correct or not (as we’re confused about 2 and 6 from clue 3). 6 is placed at the first position and we know at first position 0 is placed. This makes 6 wrong and automatically 2 becomes right (from clue 3) and as per this clue it is already placed at the correct place i.e; third place. So, after decoding this clue we have * 0?2*.

Clue 2: 614 (One digit is right but in the wrong place)

We know already that 6 is not right. Now, the confusion is about 1 and 4. To decode this we can focus on their places, 4 is present in the third place i.e; the place of digit 2. So, 4 is placed at the wrong place and as per this clue, one digit is right but placed at the wrong position. This makes 4 go to the second place. So the final code to unlock the lock is * 042*.