Final answer:
The pair of statements Q ≡ N and (N • ~Q) ѵ (Q • ~N) are contradictory because they represent a statement and its negation, which cannot both be true at the same time.
Step-by-step explanation:
When analyzing the given pair of statements Q ≡ N and (N • ~Q) ⋃ (Q • ~N), we need to understand their logical relations. The statement Q ≡ N means that Q is logically equivalent to N. The statements are consistent when it is possible for both to be true. On the other hand, a contradictory involves a statement and its negation, such as 'My dog is on her bed and my dog is not on her bed.' By examining the statements, we observe the second compound statement ((N • ~Q) ⋃ (Q • ~N)) is a contradiction, as one part is the negation of the other and both cannot be true concurrently. Hence, these statements are not consistent, logically equivalent, or coherent, but they are contradictory.