Live GMAT classes with Target Test Prep start Nov 21 and Nov 22. First class free.

See classes
Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

Newsweek Readers’ Choice Awards 2026 winner: Target Test Prep, #1 Test Prep

Target Test Prep was voted #1 Best Test Prep in the 2026 Newsweek Readers’ Choice™ Awards.

★★★★★5.0563 reviews
GMATLiveTeachStarts Nov 22
Josh Braslow, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Josh Braslow, 20+ years in test prep

Nov 22 · Josh Braslow
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemandStart anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

EXECUTIVE ASSESSMENT

with

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemandStart anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions

is rst=1

Expert replies
by djkvakin » Wed Dec 09, 2009 4:12 pm
Is R*S*T=1?
I: R*S=1
II: S*T=1

The answer is E, which is obvious, but PLEASE HELP ME UNDERSTAND THE LOGIC OF TEST GIVERS!!!! My answer is C, but when I say it's C, I mean that R*S*T DOES NOT equal to 1 taken both conditions together. We can say with certainty that when I and II taken together, the product of R S and T will NOT equal to 1. So our answer to the question if R*S*T=1, is a definite NO, and we discovered that by applying both conditions together.
Am I going crazy?
Join the discussion
Source: — Data Sufficiency |

by Testluv » Wed Dec 09, 2009 4:40 pm
djkvakin wrote:Is R*S*T=1?
I: R*S=1
II: S*T=1

The answer is E, which is obvious, but PLEASE HELP ME UNDERSTAND THE LOGIC OF TEST GIVERS!!!! My answer is C, but when I say it's C, I mean that R*S*T DOES NOT equal to 1 taken both conditions together. We can say with certainty that when I and II taken together, the product of R S and T will NOT equal to 1. So our answer to the question if R*S*T=1, is a definite NO, and we discovered that by applying both conditions together.
Am I going crazy?
Why do you think you have a definite No? Can't all of R, S, and T just equal 1? (I guess maybe you're assuming that R, S, and T are necessarily distinct?) And, to be clear, if you ever do get a definite no answer to a yes/no DS question, then you have sufficiency.
Kaplan Teacher in Toronto
Join the discussion

by raj_aabr » Thu Dec 10, 2009 1:24 pm
Is R*S*T=1?
I: R*S=1
II: S*T=1


S1) There is no information about "T" ---> Insufficient.
S2) There is no information about "R" ---> Insufficient.

Combined.
There is condition given so you can assume any numbers.
Assume R=1, S=1 and T=1 -----> The ans is YES, but,
if R=6, S=1/6 and T=6 -------> Then the ans is NO.

So the ans E.
Join the discussion