GMAT Changed on April 16th - Read about the latest changes here

 It is currently 24 Apr 2018, 05:51

### GMAT 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

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

Practice
Pays

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# If a>b>c>d and a,b,c and d are integers, what is the probability that

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Aug 2009
Posts: 5776
If a>b>c>d and a,b,c and d are integers, what is the probability that [#permalink]

### Show Tags

01 Jan 2018, 09:03
00:00

Difficulty:

85% (hard)

Question Stats:

38% (01:56) correct 62% (01:42) wrong based on 37 sessions

### HideShow timer Statistics

If $$a>b>c>d$$ and a,b,c and d are integers, what is the probability that product $$abcd$$ is positive?

(1) Only one number is on left side of 0 on the number line.
(2) $$bc$$ is positive

NEW question
[Reveal] Spoiler: OA

_________________

Absolute modulus :http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html

GMAT online Tutor

PS Forum Moderator
Joined: 25 Feb 2013
Posts: 1056
Location: India
GPA: 3.82
Re: If a>b>c>d and a,b,c and d are integers, what is the probability that [#permalink]

### Show Tags

01 Jan 2018, 09:19
chetan2u wrote:
If $$a>b>c>d$$ and a,b,c and d are integers, what is the probability that product $$abcd$$ is positive?
1) only one number is on left side of 0 on the number line.
2) $$bc$$ is positive

NEW question

to find probability of $$abcd>0$$

Statement 1: From this we know that one number is negative but others can be positive or $$0$$. Hence $$abcd$$ can be positive or $$0$$. Insufficient

Statement 2: Nothing mentioned about $$a$$ & $$d$$. Insufficient

Combining 1 & 2: we know only 1 number is negative and as $$bc>0$$ so both cannot be negative or $$0$$. hence $$a>b>c>0$$ and $$d<0$$.

Therefore $$abcd<0$$. Sufficient

Option C
Manager
Joined: 18 Nov 2009
Posts: 76
Location: Switzerland
Concentration: Entrepreneurship, Technology
GMAT 1: 740 Q47 V45
Re: If a>b>c>d and a,b,c and d are integers, what is the probability that [#permalink]

### Show Tags

12 Mar 2018, 02:00
1
KUDOS
Hello chetan2u

Does not statement 1 imply that product abcd can be zero (if c equals zero) or negative (if all 3 c, b and a are positive) but never positive? Which would mean that probability of it being positive is zero? And that would make statement 1 alone sufficient?

Thanks for explaining what I might be missing.
Re: If a>b>c>d and a,b,c and d are integers, what is the probability that   [#permalink] 12 Mar 2018, 02:00
Display posts from previous: Sort by

# If a>b>c>d and a,b,c and d are integers, what is the probability that

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.