Last visit was: 15 Nov 2024, 00:54 It is currently 15 Nov 2024, 00:54

Close

GRE Prep Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GRE score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel
User avatar
Retired Moderator
Joined: 07 Jun 2014
Posts: 4813
Own Kudos [?]: 11157 [2]
Given Kudos: 0
GRE 1: Q167 V156
WE:Business Development (Energy and Utilities)
Send PM
avatar
Manager
Manager
Joined: 29 Nov 2017
Posts: 190
Own Kudos [?]: 135 [0]
Given Kudos: 0
Location: United States
GRE 1: Q142 V146
WE:Information Technology (Computer Software)
Send PM
avatar
Intern
Intern
Joined: 02 Jul 2018
Posts: 9
Own Kudos [?]: 18 [2]
Given Kudos: 0
Send PM
User avatar
Intern
Intern
Joined: 07 May 2020
Posts: 20
Own Kudos [?]: 19 [0]
Given Kudos: 0
Send PM
Re: ab > 0 and bc < 0 [#permalink]
draw a table and you will see the answer:

According to the premise signs of variables are defined as follows:

A (1) - or (2) +

B (1) - or (2) +

C (1) + or (2) -

Obviously multiplication of a*c in either case gives us a negative number, which is less than Zero
avatar
Intern
Intern
Joined: 30 May 2020
Posts: 8
Own Kudos [?]: 6 [0]
Given Kudos: 0
Send PM
Re: ab > 0 and bc < 0 [#permalink]
a * b > 0
b * c < 0

multiply equations. = a * b^2 * c < 0
b^2 > 0
= > a *c < 0
avatar
Intern
Intern
Joined: 23 May 2020
Posts: 14
Own Kudos [?]: 15 [2]
Given Kudos: 0
Send PM
Re: ab > 0 and bc < 0 [#permalink]
2
IshanGre wrote:
Because C is negative hence the option is B.


C is not necessarily negative

but the trick here is that c and a will definitly have opposite signs

ab>0:

a positive and b positive or a negative and b negative

bc<0:

b is negative and c is positive or b ispoisitive and c is negative

since b and a have the same signs, and b and c have opposite signs, then definitely a and c will have opposite signs
Intern
Intern
Joined: 11 Jun 2022
Posts: 38
Own Kudos [?]: 25 [0]
Given Kudos: 187
Send PM
Re: ab > 0 and bc < 0 [#permalink]
Carcass could you please add the OA as B considering Option A will always be negative so Option B > Option A.
Verbal Expert
Joined: 18 Apr 2015
Posts: 29960
Own Kudos [?]: 36223 [0]
Given Kudos: 25903
Send PM
ab > 0 and bc < 0 [#permalink]
Expert Reply
iASindia wrote:
Carcass could you please add the OA as B considering Option A will always be negative so Option B > Option A.


The OA is already B stated under the spoiler

ab>0

a and b are both positive or negative

bc >0

Now is the above ab>0 b is negative a is negative as well. And b is negative and C MUST be positive


IF

ab is both positive

then

b is positive and c must be negative

In the first scenario we do have a negative and c positive so a*c is negative and <0

In the second a is positive and c is negative and a*c is negative

The answer is B
Prep Club for GRE Bot
ab > 0 and bc < 0 [#permalink]
Moderators:
GRE Instructor
78 posts
GRE Forum Moderator
37 posts
Moderator
1111 posts
GRE Instructor
234 posts

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne