A Number Lock has a 3-Digit Key
Hints :
6 3 1 - One number is correct and well placed.
7 3 0 - Nothing is correct.
1 0 2 - Two numbers are correct but wrongly placed.
6 7 8 - One number is correct but wrongly placed.
0 8 7 - One number is correct and well placed.
Can you find the 3 digit key for the number lock ?