Question 401378
any even number can be expressed by {{{2n}}}, (when n is any integer)
any odd number can be expressed by {{{2k+1}}}, (when k is any integer)
The sum of one odd and one even number is {{{2n+(2k+1)=2n+2k+1=2(n+k)+1}}}
{{{2(n+k)+1}}} is odd number
So one odd and one even number whose sum gives even number DOESN'T EXIST