Thanks for the question! Sure, let’s take a look at diagramming (E), sentence by sentence.
First, we’re told that all of the bicycle helmets sold in this store have some plastic in them. This is an “all” statement, and remember we diagram All X are Y as X —> Y. So this is
Bicycle helmet sold in this store —> Has some plastic in it
Next, most of the bicycle helmets sold in this store have some rubber in them. This is a straightforward most statement:
Bicycle helmet sold in this store —most—> Has some rubber in it
Next, we’re told that “since no helmets that have rubber in them do not also have plastic in them…” This is also going to be our last premise. This is a no statement. Remember we diagram No X are Y as X —> ~Y. Here, “X” is “helmet has rubber” and “Y” is “doesn’t have plastic.” So this is
Helmet has rubber —> Helmet has plastic
Since double negatives cancel out. Finally, the conclusion is that most helmets in this store with plastic have rubber. So this is
Helmet in this store & Has plastic —most—> Has rubber
Hope this helps! Feel free to ask any other questions that you might have.
izzyAugust 9, 2020
This helps! The "some" in the description was throwing me off. Thank you!
