Is the sum of an even whole number and an odd whole number always odd?

Is the sum of an even whole number and an odd whole number always odd?
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Answer :

Yes---------------------------------------------Let n be an integer. Then 2n is an even numberLet m be an integer. Then 2m is an even number and 2m + 1 is anodd number.Then:even + odd = (2n) + (2m + 1)= (2n + 2m) + 1= 2(n + m) + 1= 2k + 1 (where k = m + n) which is an odd number.
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