This has been on frontpage before.

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Answer is 042
Let us start with 738 since non is correct then the number does not contain 7, 3 or 8.

780 one number is correct but wrongly placed. The only correct number would be 0.

206 two numbers are correct but wrongly placed. Then since 0 is a correct number and can't be in second or third position then it is the first number. Either 2 or 6 is also part of the code.

682 one number is correct and rightly placed. Can't be 6 since 0 is the first number, not 8, then definitely it is 2 as the number in the 3rd position.

That leaves 614 one number is correct but wrongly placed. If it is 1 it would be rightly placed. Last number is 4. Code is 042

602

042

601

Lifezone247

620

0 4 2

042 is the code... 3rd hint disputes those saying 062

MrRichy:
u want my brain to knock abi ??
abeg person never chop..

let it knock it is of no use

042...how many times we go see this on fp

Enugu code: 042

MrRichy:
u want my brain to knock abi ??
abeg person never chop..

let it knock it is of no use

601

lifezone247:
Where are the genius in the house?

042

042 my brain still works well even with the recession...

042 is the code

601

042 confirmed

601

419

620 is correct code check very well..

it's definitely 062

It's 0 6 2.

I think I've seen it on nairaland before

042

601

106...quote me

It's either 660, 220, 606, 202

042 or 012

042

Looking at it closely, just 2 numbers are correct, 0 and 6. So the code will be between the combination of those two numbers.
If you reason differently, prove objectively

012!