The sum of two odd numbers:
NOTE: x is a odd number
(x + 2) + (y + 2) = x + y + 4 which is an even number
Ex.
x = 1
y = 5
(x + 2) + (y + 2) = x + y + 4
(1 + 2) + (5 + 2) = 1 + 5 + 4
3 + 7 = 6 + 4
10 = 10
So meaning, if two odd numbers are added to each other, the sum is going to be an even number.
Example 2:
1, is a odd number.
When 1 is added by the next odd number: 3, the sum is 4 which is an even number.
