BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

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.

★★★★★5.0559 reviews
Vote for Target Test Prep, Newsweek Readers’ Choice Awards 2026
NEWSWEEK READERS’ CHOICE 2026

BIG NEWS! Target Test Prep has been nominated, and they’d love your vote!

TTP has worked incredibly hard to build the best test prep experience possible, and winning Newsweek’s 2026 Readers’ Choice Award for Best Test Prep would mean a lot to them. If TTP has helped you, they’d be incredibly grateful for your vote. You can vote once each day through September 9.

Vote for TTP
GMATLiveTeach 7 seats left
Chris Peckover
NEXT LIVE COHORT

Oct 13 to Jan 7, 2027

with Chris Peckover

Schedule
Tue, Thu · 8:00 to 10:00 PM ET
Included
40 live hours + 6 months of GMAT OnDemand
  • Live instruction and real-time questions
  • Class recordings and assigned practice
View class & enroll
Limited cohort · enrollment openTarget Test Prep
EALiveTeach 5 seats left
Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

Schedule
Sun · 9:30 AM to 12:30 PM ET
Included
Live EA class + 6 months of EA OnDemand
  • Expert-led weekly online sessions
  • EA Masterclass access between classes
View EA class & enroll
Limited cohort · enrollment openTarget Test Prep
GMATOnDemand Start 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

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

great mathematical scientists

Expert replies
by uptowngirl92 » Thu Oct 29, 2009 2:22 pm
Ranked among great mathematical scientists such as Archimedes, Kepler, and Newton, Abu Ali al-Hasan ibn al-Haytham, who was born in Iraq in 965 C.E., had experimented extensively with light and vision, laying the foundation for modern optics and also the notion of science being based on experiment as well as on philosophical arguments.
A. al-Haytham, who was born in Iraq in 965 C.E., had experimented extensively with light and vision, laying the foundation for modern optics and also the notion of science being based on experiment as well as
B. al-Haytham, born in Iraq in 965 C.E., experimented extensively with light and vision, laying the foundation for modern optics and for the notion that science should be based on experiment as well as
C. al-Haytham, born in Iraq in 965 C.E., and who experimented extensively with light and vision, thereby laid the foundation for modern optics and also for the notion that science should be based on not only experiment but also
D. al-Haytham was born in Iraq in 965 C.E., and had experimented extensively with light and vision, laying the foundation for modern optics and for the notion that science should be based on not only experiment but also
E. al-Haytham was born in Iraq in 965 C.E., experimenting extensively with light and vision and laying the foundation for modern optics and for the notion of science being based on experiment as well as
Gprep question..please explain your answers
Join the discussion
Source: — Sentence Correction |

by gmatv09 » Thu Oct 29, 2009 4:56 pm
IMO B

Parallelism ==> for modern optics and for the notion
Join the discussion

by tanviet » Thu Oct 29, 2009 5:09 pm
"for the notion that..." is right."for the notion being" distort meaning.

"had experimented" is wrong because there is no action prior to past point of time or past action.

"anh who..." is wrong because there is no "who..." which is before "and who..."

E suggest that "experienting" happen when the person was born. ",doing" show an action happen at the same time and not separated from main verb.

B is left.
Join the discussion

by dare2dream » Thu Oct 29, 2009 8:24 pm
IMO B.
Join the discussion

by 2010gmat » Fri Oct 30, 2009 10:31 am
A. al-Haytham, who was born in Iraq in 965 C.E., had experimented extensively with light and vision, laying the foundation for modern optics and also the notion of science being based on experiment as well as -- past perfect not reqd + laying foundation for x and for Y -- parallelism rule broken

B. al-Haytham, born in Iraq in 965 C.E., experimented extensively with light and vision, laying the foundation for modern optics and for the notion that science should be based on experiment as well as

C. al-Haytham, born in Iraq in 965 C.E., and who experimented extensively with light and vision, thereby laid the foundation for modern optics and also for the notion that science should be based on not only experiment but also

D. al-Haytham was born in Iraq in 965 C.E., and had experimented extensively with light and vision, laying the foundation for modern optics and for the notion that science should be based on not only experiment but also

E. al-Haytham was born in Iraq in 965 C.E., experimenting extensively with light and vision and laying the foundation for modern optics and for the notion of science being based on experiment as well as
Gprep question..please explain your answers
Join the discussion

by mehravikas » Fri Oct 30, 2009 1:56 pm
IMO - B
Join the discussion

by pandeyvineet24 » Wed Dec 23, 2009 9:27 am
Reopening this thread. Can any one explain what is the main verb in B ? I think B has a series of modifiers.
Join the discussion

by hrishi19884 » Wed Dec 23, 2009 12:04 pm
Ranked among great mathematical scientists such as Archimedes, Kepler, and Newton, Abu Ali al-Hasan ibn al-Haytham, who was born in Iraq in 965 C.E., had experimented extensively with light and vision, laying the foundation for modern optics and also the notion of science being based on experiment as well as on philosophical arguments.

A. al-Haytham, who was born in Iraq in 965 C.E., had experimented extensively with light and vision, laying the foundation for modern optics and also the notion of science being based on experiment as well as
Incorrect: "for modern optics and also the notion" is not parallel.

B. al-Haytham, born in Iraq in 965 C.E., experimented extensively with light and vision, laying the foundation for modern optics and for the notion that science should be based on experiment as well as
Correct : *"for modern optics and for the notion" -- parallelism
* "notion that" ---> "that" is required to explain the second part of conjunction "for the notion that science should be based on experiment as well as"
*"experimented"(past perfect) is followed by "laying"(past participle)

C. al-Haytham, born in Iraq in 965 C.E., and who experimented extensively with light and vision, thereby laid the foundation for modern optics and also for the notion that science should be based on not only experiment but also
Incorrect :*for modern optics and also for the notion ----> no parallelism
* "and who experimented" seems absurd

D. al-Haytham was born in Iraq in 965 C.E., and had experimented extensively with light and vision, laying the foundation for modern optics and for the notion that science should be based on not only experiment but also
Incorrect : "should be based on not only " is wrong. It should be "should be based not only on"

E. al-Haytham was born in Iraq in 965 C.E., experimenting extensively with light and vision and laying the foundation for modern optics and for the notion of science being based on experiment as well as
Incorrect: "experimenting extensively" changes tense. Hence insufficient.
Hrishi

"As you sow, so shall you reap"
Join the discussion

• Page 1 of 1