PT48, S1, Q14 Among a sample of diverse coins from an

by **angela** Tue Sep 22, 2009 3:15 pm

14. (D)
Question type: Inference
The argument states that if a coin has a judge’s head on one side, it always has a tree on the other side. Or to diagram this logic:

Judge’s head -> Tree. The contrapositive then is: ~Tree -> ~Judge’s head.

Answer choice (D) is a perfect match for the contrapositive above. Here is how the other answer choices would map to the logic above:

(A) Explorer’s head -> ~Building (clearly nothing is known about this)
(B) Tree -> ~Judge’s head (this is reverse logic and therefore invalid)
(C) Tree -> ~Explorer’s head (this inference cannot be drawn)
(E) Explorer’s head -> ~Building (again, this inference can’t be drawn from the givens)