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Liberty Welch
Mathematics
11 August, 17:53
Show that the sum of any two odd numbers is even.
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Kaya Curtis
11 August, 18:09
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Hi here's a way to solve it
Let m and n be odd integers. Then, we can express m as 2r + 1 and n as 2s + 1, where r and s are integers.
This means that any odd number can be written as the sum of some even integer and one.
Substituting, we have that m + n = (2r + 1) + 2s + 1 = 2r + 2s + 2.
As we defined r and s as integers, 2r + 2s + 2 is also an integer.
Now It is clear that 2r + 2s + 2 is an integer divisible by 2 becasue we have 2 in each of the integers.
Therefore, 2r + 2s + 2 = m + n is even.
So, the sum of two odd integers is even.
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