Answer
a. (1) For all integers $m$ and $n$, if $m$ is even and $n$ is odd, then $m+n$ is odd. (2) For all even integers $m$ and odd integers $n$, $m+n$ is odd. (3) If $m$ is an even integer and $n$ is an odd integer, then $m+n$ is odd.
b.
[a] any odd integer
[b] integer $r$
[c] $2r+2s+1$
[d] $m+n$ is odd
Work Step by Step
The equivalent formulations of universal conditional statements are discussed beginning on page 101.
