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If n is the first number,

n + n + 1 + n + 2 + n + 3 will be the sum, which is 4n + 6.

4n is always even, and 6 is even.

Therefore, the sum of four consecutive numbers is always even.

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โˆ™ 2013-02-02 16:18:51
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Q: Why is the sum of four consecutive numbers always even?
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