Angie did the following proof in her logic class. Which step in the indirect proof did she do incorrectly?

Prove: 12 is divisible by 6.

Step 1: Assume that 12 is not divisible by 6.
Step 2: 2 times 6 is equal to 12. 12 divided by 6 is 2.
Step 3: 12 is not divisible by 6.

a. Step 3
b. Step 2
c. Step 1
d. Steps 1 and 2

Question

Angie did the following proof in her logic class. Which step in the indirect proof did she do incorrectly?

Prove: 12 is divisible by 6.

Step 1: Assume that 12 is not divisible by 6. 
Step 2: 2 times 6 is equal to 12. 12 divided by 6 is 2.
Step 3: 12 is not divisible by 6.
 
a. Step 3 
b. Step 2 
c. Step 1 
d. Steps 1 and 2

anonymous · Answer

Step 3, I think.
Step 1 assumed 12 non-divisible by 6. As an assumption, it can't be wrong. Step 2 proved the assumption false, a solid proof. All that is left is that the opposite of Step 1 is true, hence, 12 is divisible by 6. The conclusion(step 3) is wrong.

anonymous · Answer

Okay.. Thank you so much. How do I give you a medal for helping me?