If Malpighi's delivery is first and Leacock's delivery is third, then which one of the following must be true?

John on December 16, 2018

question 20

I wanted clarification on how H is not before L here, making it M,H,L. I thought rule 3 made it so If F>M -> L>H. F is not earlier than M so isnt H before L?


John on December 16, 2018

nvm lol

Ravi on December 17, 2018


it sounds like you might have figured it out, but here's further clarification in case you need it. H could be before L in this question, but it doesn't have to be. You could also have F before L.

Rule 3 does state if F - M, then L - H. However, what I think may have been tripping you up is properly understanding the contrapositive of this rule. The contrapositive of this rule is if H - L, then M - F. If the sufficient condition of F - M, then L - H is failed, it does not mean that the necessary condition must also fail. What it means is that the rule then becomes irrelevant.

This is why F can also be in the second position, which is why the correct answer is (E) because it's the only answer that must be true...Kanzaki's delivery has to be sixth (last).