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It is quite easy to prove this using algebra.

Suppose x is the smaller of the two odd integer. The fact that x is odd means that it is of the form 2m + 1 where m is an integer.

[m integer => 2m is an even integer => 2m + 1 is odd]

The next odd integer will be x + 2, which is (2m + 1) + 2 = 2m + 3

The sum of these two consecutive odd integers is, therefore,

2m + 1 + 2m + 3 = 4m + 4 = 4(m + 1)

Since m is an integer, m+1 is an integer and so 4(m + 1) represents a factorisation of the answer which implies that 4 is a factor of the sum. In other words, the sum is a multiple of 4.

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Q: Why is the sum of consecutive odd integers always a multiple of 4?
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