1. An if-then statement is false if, and only if, the hy- 7. A conditional statement and its converse are pothesis is and the conclusion is not 2. The negation of "if p then q " is 8. " R is a sufficient condition for S" means "if 3. The converse of "if p then q" " is then 4. The contrapositive of "if p then q " is 9. " R is a necessary condition for S " means "if 5. The inverse of "if p then q " is then 6. A conditional statement and its contrapositive 10. " R only if S " means " if then are