Justin wrote the following indirect proof:

Prove: 7 is a factor of 91.

Step 1: Assume that 7 is a factor of 91.
Step 2: 91 divided by 7 is 13.
Step 3: A factor is an integer by which another integer is divisible.
Step 4: Therefore, 7 must be a factor of 91.

Which step in Justin's proof is incorrect?

Step 1

Step 2

Step 3

Step 4

Question

Justin wrote the following indirect proof:

Prove: 7 is a factor of 91.

Step 1: Assume that 7 is a factor of 91.
Step 2: 91 divided by 7 is 13.
Step 3: A factor is an integer by which another integer is divisible.
Step 4: Therefore, 7 must be a factor of 91.

Which step in Justin's proof is incorrect?

 Step 1

 Step 2

 Step 3

 Step 4

anonymous · Answer

I don't get this problem because they are all correct

mehek14 · Answer

Factors are numbers you can multiply together to get another number
in step 3, it says A factor is an integer by which another integer is divisible.

parthkohli · Answer

I don't see a problem in step 3.

mehek14 · Answer

but the definition of factor is wrong in step 3

anonymous · Answer

They all seemed correct

mehek14 · Answer

$\bf{factors\rightarrow{multiplication}}$

anonymous · Answer

Ok thank you