1.) First of all if P is false and Q is true then result is false. Why this?
2.) If Juan has a smartphone, then 2+3=5.
If Juan has a smartphone then both propositions true and answer is true.
If Juan does not have a smartphone then first proposition is false and second is true and answer is false.
How false does not implies truth?
I want to explain this to person for which this is new topic. So very basic explanation can help.