Question 1
What is a direct proof?
Question 2
To prove that if $n$ is an even integer, then $n^2$ is even, which starting statement is most appropriate?
Question 3
Which statement is best proved by direct proof?
Question 4
Which sentence is the best example of a conclusion reached in a direct proof?
Question 5
Let $a$ and $b$ be even integers. What is a correct direct proof step to show that $a+b$ is even?
