Question 1
"The surface of Saturn's moon, Titan, does not have water. Given that the surface of Titan has either water or liquid methane, it follows that it has liquid methane" is
◦ modus ponens
◦ modus tollens
◦ contraposition
◦ disjunctive syllogism
◦ hypothetical syllogism
Question 2
"Washington's subway service will get better this year, for if there is a fare increase, the subway service will get better. And there will be a fare increase, beginning in July" is
◦ modus ponens
◦ modus tollens
◦ contraposition
◦ disjunctive syllogism
◦ hypothetical syllogism