If a and b are both even numbers, which of the following is an even number?  Pick one
A) a + b+3 B) a + b + 1 C) ab D) ab + 1 E) NONE
Sol.   Product of two odd numbers is always odd and adding 1 gives even.   Answer ab
<result>C</result>
If a and b are both even numbers, which of the following is an even number?