A sum.
7 and 8
5/36
No.
Every tow consecutive odd or even numbers differ by two.
A sum.
The numbers are 3 and 16.
7 and 8
Subtracting two numbers is finding their difference.
7 and 8
5/36
9 and 8 if you add them.
No.
Every tow consecutive odd or even numbers differ by two.
9 and 18
Not always.
63