For a certain pair of non-zero numbers on the number line, is 0 between the two numbers?

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Vincen: Legendary Member; Posts: 2898; Joined: Thu Sep 07, 2017 2:49 pm; Thanked: 6 times; Followed by:5 members

For a certain pair of non-zero numbers on the number line, is 0 between the two numbers?

by Vincen » Fri Jul 09, 2021 11:07 am

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For a certain pair of non-zero numbers on the number line, is 0 between the two numbers?

(1) the sum of two non-zero numbers is negative.
(2) the product of two no zero numbers is negative.

Answer: B

Source: GMAT Prep

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Source: Beat The GMAT — Data Sufficiency | Fri Jul 09, 2021 11:07 am

swerve: Legendary Member; Posts: 2499; Joined: Sun Oct 29, 2017 2:04 pm; Followed by:6 members

Re: For a certain pair of non-zero numbers on the number line, is 0 between the two numbers?

by swerve » Wed Jul 14, 2021 4:04 pm

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Vincen wrote: ↑
Fri Jul 09, 2021 11:07 am
For a certain pair of non-zero numbers on the number line, is 0 between the two numbers?

(1) the sum of two non-zero numbers is negative.
(2) the product of two no zero numbers is negative.

Answer: B

Source: GMAT Prep

(1)
Case I: \(a=-2, b=1,\) then sum \(a+b=-1\) and \(0\) Is between them.
Case II: \(a=-2, b=-1,\) then sum \(a+b=-3,\) but \(0\) is NOT between them.
Not Sufficient \(\Large{\color{red}\chi}\)

(2)
Either \(a\) or \(b\) has to be negative, but not both
\(0\) MUST like between \(a, b\)
Sufficient \(\Large{\color{green}\checkmark}\)

Therefore, B