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

Redeem

The numbers in which of the following pairs do NOT have a

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Problem Solving |

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 2623
Joined: Mon Jun 02, 2008 3:17 am
Location: Montreal
Thanked: 1090 times
Followed by:355 members
GMAT Score:780

by Ian Stewart » Mon Jul 01, 2019 6:35 am
32 = 2^5 has only one prime divisor, so it could never have a "pair" of distinct prime divisors in common with any other number. So the answer is C.
For online GMAT math tutoring, or to buy my higher-level Quant books and problem sets, contact me at ianstewartgmat at gmail.com

ianstewartgmat.com
Top

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 8086
Joined: Sat Apr 25, 2015 10:56 am
Location: Los Angeles, CA
Thanked: 43 times
Followed by:29 members

by Scott@TargetTestPrep » Tue Jul 02, 2019 5:42 pm
Gmat_mission wrote:The numbers in which of the following pairs do NOT have a pair of distinct prime divisors in common?

A. 10 and 20
B. 12 and 18
C. 24 and 32
D. 21 and 63
E. 22 and 88

[spoiler]OA=C[/spoiler]

Source: GMAT Paper Test
We see that 10 and 20 have prime factors 5 and 2 in common, and 12 and 18 have prime factors 2 and 3 in common, but 24 and 32 have only a 2 in common, so they do not have a pair of distinct prime factors in common.

Answer: C

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
Top
Post new topic Post Reply
• Page 1 of 1