If A, then B.
If B, then C.
If C, then D.
If all of the statements above are true, which of the following must also be true?
(A) If D, then A.
(B) If not B, then not C.
(C) If not D, then not A.
(D) If D, then E.
(E) If not A, then not D.
The use of gravity waves
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Question:
The use of gravity waves, which do not interact with matter *in the way
electromagnetic waves do, hopefully will enable* astronomers to study the...
16 years ago
1 comment:
Answer (C)
If A, Then B
A implies B True
B Implies A False (converse)
not A implies not B False (Inverse)
not B implies not A True (Contra positive)
(A) If D, then A. Converse - Ruled out
(B) If not B, then not C. Inverse - Ruled out
(C) If not D, then not A. Contrapositive - Answer
(D) If D, then E. ????
(E) If not A, then not D Inverse - Ruled out
So, answer is C
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