Last visit was: 11 Dec 2024, 11:26 It is currently 11 Dec 2024, 11:26
Close
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Close
Request Expert Reply
Confirm Cancel
User avatar
Sajjad1994
User avatar
GRE Forum Moderator
Joined: 02 Nov 2016
Last visit: 10 Dec 2024
Posts: 14,156
Own Kudos:
41,536
 [3]
Given Kudos: 5,905
GPA: 3.62
Products:
Posts: 14,156
Kudos: 41,536
 [3]
1
Kudos
Add Kudos
2
Bookmarks
Bookmark this Post
avatar
TrevorKleeTutor
Joined: 20 Jul 2016
Last visit: 24 Jun 2024
Posts: 88
Own Kudos:
77
 [1]
Given Kudos: 9
Posts: 88
Kudos: 77
 [1]
Kudos
Add Kudos
1
Bookmarks
Bookmark this Post
User avatar
gvij2017
Joined: 09 Aug 2017
Last visit: 18 Jun 2024
Posts: 680
Own Kudos:
Given Kudos: 778
Posts: 680
Kudos: 448
Kudos
Add Kudos
Bookmarks
Bookmark this Post
User avatar
Sajjad1994
User avatar
GRE Forum Moderator
Joined: 02 Nov 2016
Last visit: 10 Dec 2024
Posts: 14,156
Own Kudos:
41,536
 [1]
Given Kudos: 5,905
GPA: 3.62
Products:
Posts: 14,156
Kudos: 41,536
 [1]
Kudos
Add Kudos
1
Bookmarks
Bookmark this Post
Explanation

This parallel reasoning stimulus can be easily translated in algebraic terms: If color-blind (If X), then can’t differentiate green and brown (then Y). Gerald can’t differentiate those colors (Since Y), so he must be color-blind (therefore X). This is a common logic error; it’s called the fallacy of affirming the consequent—you’re not allowed to simply transpose the if and then clauses of a conditional statement. (B) is set up in the same way: X is “suffering from sinusitis,” Y is “losing one’s sense of smell,” and Mary plays the role of Gerald.

(A) and (D) represent a straightforward “If X, then Y; William (or Arthur, depending) is X, therefore he’s Y.”

(C) is proper logic. Those who have had jaundice X can’t give blood Y, and so—here comes the contrapositive—since Jean gave blood not Y, she can’t have had jaundice not X. That’s absolutely valid and not parallel to the original.

(E) “Since X, therefore Y; Frieda’s X, therefore Z.” Where’d that Z term come from? (E)’s not parallel either

Answer: B

Hope it helps
Moderators:
GMAT Club Verbal Expert
7153 posts
GMAT Club Verbal Expert
234 posts