Question

help i will give medal

Alex wrote the following indirect proof:

Answer 1

Prove: 13 is a factor of 195

Step 1: Assume that 13 is not a factor of 195.
Step 2: 195 divided by 13 is 15.
Step 3: A factor is an integer by which another integer is a multiple.
Step 4: Therefore, 13 must be a factor of 195.

Which step in Alex's proof is incorrect?

Answer 2

?

Step 1

Step 2

Step 3

Step 4

Answer 3

please help

Answer 4

im going to close this quastun if no one helps