Question

What would you assume at the beginning of an indirect proof for the following?

A number divisible by 2 is even. The number 13 is not even.

A. Even numbers are not divisible by 2
B. Even numbers are divisible by 2
C. The number 13 is not even
D. The number 13 is even

Answer 1

In an indirect proof, you want to assume what you need to prove is false. In this case, what do you need to prove?

Answer 2

that 13 is even?

Answer 3

close, the number 13 is NOT even. that's what you need to prove. but you're going to assume that's false, so what you said. That 13 is even. that's what you'll assume, not need to prove. see the difference?

Answer 4

you basically went a step ahead of me.

Answer 5

yes thank you! goemetry is very confusing to me

Answer 6

i know, it gets messy sometimes. just be logical about everything, and you'll do fine