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Question: You forgot the three digit code of your safe. But you have written some hints to calculate the code if you forgot the code.
Below are the hints that you have written

Hint-1 : One of the numbers is correct and is placed in its correct position
5 4 7

Hint-2: Nothing is correct
5 3 0

Hint-3: Two numbers are correct but not placed at its correct position.
2 5 9

Hint-4: One number is correct but not placed at its correct position.
7 0 6

Hint-5: One number is correct but not placed at its correct position.
6 4 9

What's is the code?

Solution:



927

Explanation
1) 5 4 7 : 7 is placed correctly
2) 5 3 0 : None of the numbers is in the code
3) 2 5 9 : 2 & 9 are correct number of code but placed at wrong position
4) 7 0 6: Number 7 is there but placed at wrong position
5) 6 4 9: Number 9 is there but placed at wrong position

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