In the multiplication given below, all the digits, except one, were consistently
replaced by another digit:
617
* 702
_______
1639
3733
2807
__________
265699
Find the substitution code and restore the original multiplication.
There are two possible solutions, and these are:
(I)
7 5 4
4 9 3
---------
5 7 6 2
6 4 6 6
3 8 9 4
------------------
3 7 1 7 2 2
-------------------
(II)
5 1 6
6 9 3
-----------
1 5 4 8
4 6 4 4
3 0 9 6
-------------------
3 5 7 5 8 8
-------------------