Let p, q, and r be propositions and the expression (p→q)→r be a contradiction. Then, the expression (r→p)→q is
A. a tautology
B. a contradiction.
C. always TRUE when p is FALSE.
D. always TRUE when q is TRUE.
Answer:D
Let p, q, and r be propositions and the expression (p→q)→r be a contradiction. Then, the expression (r→p)→q is
A. a tautology B. a contradiction. C. always TRUE when p is FALSE. D. always TRUE when q is TRUE.