House numbers are often odds on one side of the street, evens on the other.
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The sum of two odd numbers is always even; the sum of three odd numbers is always odd; the sum of four odd numbers is always even; the sum of five odd numbers is always odd; etc
The sum of two odd numbers or two even numbers is an even number. The sum of an odd number and an even number is an odd number.
Yes. Even + Even = Even, Odd + Odd = Even and Even + Odd or Odd + Even = Odd
If the sum of two numbers is even, the two numbers are either both even or both odd. A few examples:2 + 4 = 6 (even + even = even)2 + 3 = 5 (even + odd = odd)5 + 2 = 7 (odd + even = odd)7+13 = 20 (odd + odd = even)