Question

Am I right?
“All dogs are mammals.”
Which of these is a logically equivalent statement?

All animals that are not dogs are not mammals.

If it is not a dog, it is not a mammal.

All dogs are furry.

If it is not a mammal, it is not a dog.

Answer 1

no this is in my geometry class

Answer 2

its the last statement
if P then Q is equivalent to if not q then not P

Answer 3

no, you are wrong ,
counter example , human are mammal but most of the time they are not dog

Answer 4

Technically none of these options are right.

Answer 5

haha yeah thats the one i meant. i put the wrong one i did choose the last one

Answer 6

Its the last statement

Answer 7

thanks :)