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I originally picked B for this question because if R is 1st then it is true that T must be 7th since there are only two places for T to go according to the 3rd rule.

Is E the correct answer because T must be the sufficient condition and R must be the necessary condition in order to replicate all of the impacts of the 4th rule?

 Rachael Wilkenfeld
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Hi Awash,

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!
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When doing this question originally, I realized that the new rule would need to force R into 1 when T is not there so I eliminated everything but A and E. I ended up picking E because it was a conditional and closest to the original rule. Can someone explain why A is incorrect?


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