- Wed Oct 10, 2018 6:00 pm
For this one, we want something that forces R to be in 1 whenever T is not in 1. When is T not in 1? When T is in 7. We could rewrite the rule to say when T is in 7, R is in 1. As I read the question, that would be my strong prephrase.
Answer choice (B) is the mistaken reversal of the rule we want. It says if R is in 1, T is in 7. That's true if anyone is in 1, since T has to be in either 1 or 7. We need something that tells us when T is in 7, R must be in 1. That's what answer choice (E) does.
Hope that helps!