GMAT Quantitative Reasoning Practice Test 3

Try to find opposing examples to the statements.
1. Pick $\mathit{A}=7,\mathit{B}=13$
$\mathit{A}+\mathit{B}=20$, this is an even number.
2. Try $\mathit{A}=3,\mathit{B}=7$
$\mathit{A}\mathit{B}=21$, and 21 is not a prime number.
3. Try $\mathit{A}=3,\mathit{B}=5$
$\mathit{A}\mathit{B}=35=3\times 3\times 3\times 3\times 3=$ a number which is dividable by 3 and 9 and therefore is not a prime number. Statements 2 and 3 can't be true.