The following table represents addition of two six-digit numbers given in the first and the second rows, while sum is given in the third row. In the representation, each of the digits $0,1,2,3,4,5,6,7,8,9$ has been coded with one letter among A,B,C,D,E,F,G,H,I,J,K, with distinct letters representing distinct digits.
Which among the digits $3,4,6$ and $7$ cannot be represented by the letter D?_____
D cannot be 7.
G,K,J can be (4,7,3) in this case D=6 or (8,3,7) where D can be 6 again, (7,4,6) where D can be 3.
Please refer to my points 5&6 in the below link for detailed reasoning of what values of G,K,J can be.