SOLUTION: Determine by showing work and using any method whether argument is valid The number 91 is prime just in case it is not composite. The number 91 is not both prime and divisible b

Algebra ->  Proofs -> SOLUTION: Determine by showing work and using any method whether argument is valid The number 91 is prime just in case it is not composite. The number 91 is not both prime and divisible b      Log On


   

Question 607887: Determine by showing work and using any method whether argument is valid
The number 91 is prime just in case it is not composite. The number 91 is not both prime and divisible by 2. The number 91 is divisible by 2. Therefore the number 91 is composite.

Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
"91 is composite" is correct but not for the right reason.

91 = 7*13, cannot be both prime and divisible by two other factors. Therefore 91 is composite.