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The sum of 3 consecutive whole numbers is always equal to 3 times the middle number in that sequence.
Because an integer is a whole number and the sum of any two or more whole numbers is always a whole number.
The sum of any two consecutive whole numbers is always odd, and equal to one more than twice the first number (2x+1).
Since one of the numbers will be even and the other odd, the sum will always be odd.
Two odd numbers always sum to an even number. Always. Two even numbers always sum to an even number, and an odd number and an even number always sum to an odd number.