Question

p-->q is false when???
p is true and q is false?
both p and q are false?
p is false and q is true?

Answer 1

If q is false, then p is false.

Answer 2

Both of them are false then?

Answer 3

@John_ES

Answer 4

No, if p is false the q could be true or false (you can deduce false or true from false sentences). If p is true then q must be true (only true follow true). But if q is false, the p must be false. So I pick the first one.