True or false? if you took a true "if-then" statement, inserted a not in each clause l, and reversed the clauses, the statement would also be true

The statement above is TRUE.
If a conditional statement is true, then the contrapositive statement will also be true. This also hold for the reverse, that is, if the conditional statement is false, then the contrapositive will also be false. For instance, consider these sentences:
1. If the DNA test is positive, then Mr. Frank is her father. [Conditional statement.]
2. If the DNA test is NOT positive, then Mr. Frank is NOT her father [Contrapositive statement].
These two statements means the same thing.

2.) is the most sense