4 correct, 1 in the right place
So this means the final number is 7, not 1. I also now know where some of the numbers aren't
My digits are 6 6 4 3 7
It's time to see if I can now place them 15 digits from the given number
the number is 87826
1st digit is 3 4 or 7
2nd digit is 6 4 or 7
3rd digit is 3 4 or 7
4th digit is 3 6 or 7
5th digit is 3 4 or 6
So it's time to start trying combinations
76463 which is 13 and cannot work
74366 which is 13 and cannot work
37466 which is 13 and cannot work
34766 which is 13 and cannot work
46376 which is 15
My next guess is 46376