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2015-10-14T01:53:33+08:00

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Even number.

When you add any two odd numbers, the sum is an even number.
1 1 1
2015-10-14T13:52:54+08:00
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. 
2 2 2