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If ab ≠ 0 and a^3b = ab^3, then which option must be true ? [#permalink]
09 Apr 2013, 05:44

1

This post received KUDOS

2

This post was BOOKMARKED

00:00

A

B

C

D

E

Difficulty:

35% (medium)

Question Stats:

63% (02:09) correct
38% (01:25) wrong based on 96 sessions

I got this question from Kaplan Daily GMAT question and wanted to share with all members of gmatclub for practice.

If ab ≠ 0 and a^3b = ab^3, then which of the following must be true?

I. a = b II. a = –b III. ab = 1

Options : A. None B. I only C. III only D. I and III only E. I, II, and III ------------------------------------- Please press KUDOS if you like my post.

For this product to be zero, since ab≠ we can have: a=-b OR a= b

Let's look at the options: 1. DOES NOT HAVE TO BE TRUE. Take a = 1, b = -1, for instance 2. DOES NOT HAVE TO BE TRUE. Take a = 1, b = 1, for instance 3. DOES NOT HAVE TO BE TRUE. Take a = 2, b = 2, for instance

Re: If ab ≠ 0 and a^3b = ab^3, then which option must be true ? [#permalink]
01 Nov 2014, 20:11

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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