Alex wrote the following indirect proof:
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?

Question

Alex wrote the following indirect proof:
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?

anonymous · Answer

Select one:
a. Step 1
b. Step 2
c. Step 3
d. Step 4

anonymous · Answer

@ganeshie8