Question

If $k$ represents an integer, which of the following must be even integers?
$2k,2k+6,\frac{8k}{4},3k+5,2k-1$

Answer 1

• $2k$ is always even
• $2k+6$ is always even
• $8k/4=2k$ is always even
• $3k+5$ is even for odd $k$ and odd for even $k$
• $2k-1$ is always odd
• So the correct answer is $2k,2k+6,8k/4$