• NEW! FREE Beat The GMAT Quizzes
Hundreds of Questions Highly Detailed Reporting Expert Explanations
• 7 CATs FREE!
If you earn 100 Forum Points

Engage in the Beat The GMAT forums to earn
100 points for $49 worth of Veritas practice GMATs FREE VERITAS PRACTICE GMAT EXAMS Earn 10 Points Per Post Earn 10 Points Per Thanks Earn 10 Points Per Upvote ## A new electronic security system will only allow a single pe ##### This topic has 1 expert reply and 0 member replies ## A new electronic security system will only allow a single pe A new electronic security system will only allow a single person at a time to pass through a secure door. A computer decides whether or not to unlock a secure door on the basis of visual clues, which it uses to identify people with proper clearance. The shape of the head, the shape and color of the eyes, the shape and color of the lips, and other characteristics of a personâ€™s head and face are analyzed to determine his or her identity. Only if the person trying to open a secure door has the required clearance will the door unlock. Because this new system never fails, an unauthorized person can never enter a secure door equipped with the system. If the statements above are true, which of the following conclusions can be most properly drawn? (A) The new system is sure to be enormously successful and revolutionize the entire security industry. (B) The new system can differentiate between people who are seeking to open a secure door and people passing by a secure door. (C) No two people have any facial features that are identical, for example, identical lips. (D) High costs will not make the new security system economically unviable. (E) The new computer system is able to identify some slight facial differences between people who look very similar, such as identical twins. I'm confused between B & E. Can any experts help? ### GMAT/MBA Expert Legendary Member Joined 14 Jan 2015 Posted: 2667 messages Followed by: 122 members Upvotes: 1153 GMAT Score: 770 Top Reply ardz24 wrote: A new electronic security system will only allow a single person at a time to pass through a secure door. A computer decides whether or not to unlock a secure door on the basis of visual clues, which it uses to identify people with proper clearance. The shape of the head, the shape and color of the eyes, the shape and color of the lips, and other characteristics of a personâ€™s head and face are analyzed to determine his or her identity. Only if the person trying to open a secure door has the required clearance will the door unlock. Because this new system never fails, an unauthorized person can never enter a secure door equipped with the system. If the statements above are true, which of the following conclusions can be most properly drawn? (A) The new system is sure to be enormously successful and revolutionize the entire security industry. (B) The new system can differentiate between people who are seeking to open a secure door and people passing by a secure door. (C) No two people have any facial features that are identical, for example, identical lips. (D) High costs will not make the new security system economically unviable. (E) The new computer system is able to identify some slight facial differences between people who look very similar, such as identical twins. I'm confused between B & E. Can any experts help? We know that the security system decides whether to open the door on the basis of visual clues. And we know that it never fails - meaning it only allows those with clearance to unlock the doors. Based on that, would B have to be true? Not necessarily. If an unauthorized person is simply walking by, the door won't open, and if an unauthorized person is attempting to open the door, the door won't open. Either way, the system doesn't fail, and so it's irrelevant whether the system can tell the difference between the two scenarios. E, on the other hand, has to be true. If the system couldn't differentiate between similar looking people, then if one person with clearance had an identical twin who did not have authorization, that unauthorized twin would be able to open the door, thus violating the premise that the system never fails. So if the system never fails, we can conclude that it must be able to differentiate between similar-looking people. _________________ Veritas Prep | GMAT Instructor Veritas Prep Reviews Save$100 off any live Veritas Prep GMAT Course

Enroll in a Veritas Prep GMAT class completely for FREE. Wondering if a GMAT course is right for you? Attend the first class session of an actual GMAT course, either in-person or live online, and see for yourself why so many students choose to work with Veritas Prep. Find a class now!
• 5 Day FREE Trial
Study Smarter, Not Harder

Available with Beat the GMAT members only code

• 5-Day Free Trial
5-day free, full-access trial TTP Quant

Available with Beat the GMAT members only code

• Free Veritas GMAT Class
Experience Lesson 1 Live Free

Available with Beat the GMAT members only code

• Award-winning private GMAT tutoring
Register now and save up to $200 Available with Beat the GMAT members only code • Magoosh Study with Magoosh GMAT prep Available with Beat the GMAT members only code • Get 300+ Practice Questions 25 Video lessons and 6 Webinars for FREE Available with Beat the GMAT members only code • FREE GMAT Exam Know how you'd score today for$0

Available with Beat the GMAT members only code

• 1 Hour Free
BEAT THE GMAT EXCLUSIVE

Available with Beat the GMAT members only code

• Free Practice Test & Review
How would you score if you took the GMAT

Available with Beat the GMAT members only code

• Free Trial & Practice Exam
BEAT THE GMAT EXCLUSIVE

Available with Beat the GMAT members only code

### Top First Responders*

1 Ian Stewart 49 first replies
2 Brent@GMATPrepNow 39 first replies
3 Jay@ManhattanReview 35 first replies
4 GMATGuruNY 29 first replies
5 ceilidh.erickson 14 first replies
* Only counts replies to topics started in last 30 days
See More Top Beat The GMAT Members

### Most Active Experts

1 Scott@TargetTestPrep

Target Test Prep

206 posts
2 Max@Math Revolution

Math Revolution

90 posts
3 Brent@GMATPrepNow

GMAT Prep Now Teacher

82 posts
4 Ian Stewart

GMATiX Teacher

56 posts
5 GMATGuruNY

The Princeton Review Teacher

50 posts
See More Top Beat The GMAT Experts