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
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.

130-point 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.

How many factors of 42 are not factors of 56?

Expert replies
Source: — Problem Solving |

by Brent@GMATPrepNow » Sat Dec 02, 2017 2:05 pm
swerve wrote:How many factors of 42 are not factors of 56?

A. 1
B. 2
C. 3
D. 4
E. 5
The fastest approach is probably to just list the factors of 42 and 56

Factors of 56: {1, 2, 4, 7, 8, 14, 28, 56}
Factors of 42: {1, 2, 3, 6, 7, 14, 21, 42}

So, the factors of 42 that are NOT factors of 56 are: 3, 6, 21 and 42 (four numbers in total)

Answer: D

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
Image
Join the discussion

by Scott@TargetTestPrep » Sun Sep 29, 2019 6:19 pm
swerve wrote:How many factors of 42 are not factors of 56?

A. 1
B. 2
C. 3
D. 4
E. 5

The OA is D.

Experts, how can I solve this PS question? I don't have it clear. Thanks.
42 = 2 x 3 x 7

56 = 7 x 8 = 7 x 2^3

So, the factors of 42 that are not of 56 are 3, 3 x 2, 3 x 7, and 2 x 3 x 7.

Answer: D

Scott Woodbury-Stewart
Founder and CEO
[email protected]

Image

See why Target Test Prep is rated 5 out of 5 stars on BEAT the GMAT. Read our reviews

ImageImage
Join the discussion