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

Redeem

GPREP (Properties of Numbers)

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Problem Solving |
Legendary Member
Posts: 829
Joined: Mon Jul 07, 2008 10:09 pm
Location: INDIA
Thanked: 84 times
Followed by:3 members

by sudhir3127 » Mon Jul 28, 2008 2:55 am
IMO A
Top
Senior | Next Rank: 100 Posts
Posts: 45
Joined: Tue Jul 22, 2008 7:24 pm
Thanked: 2 times

by warlock » Mon Jul 28, 2008 3:02 am
xy+z = x(y+z)

xy+z = xy+xz

z = xz

z-xz = 0

z(1-x) = 0

this means z=0 or (1-x) = 0

meaning z = 0 or x = 1.

so i guess the ans is option E.
Top
Master | Next Rank: 500 Posts
Posts: 118
Joined: Sun Jun 01, 2008 1:47 pm
Thanked: 5 times
Followed by:1 members

by ricky » Mon Jul 28, 2008 3:04 am
IMO E..What is OA?
Top
Legendary Member
Posts: 1153
Joined: Wed Jun 20, 2007 6:21 am
Thanked: 146 times
Followed by:2 members

by parallel_chase » Mon Jul 28, 2008 3:08 am
E absolutely. Whats the OA?
Top
Legendary Member
Posts: 829
Joined: Mon Jul 07, 2008 10:09 pm
Location: INDIA
Thanked: 84 times
Followed by:3 members

by sudhir3127 » Mon Jul 28, 2008 3:21 am
Do we need to solve the eauation and find the values of X, y, z or the question mean for what values of X, y , Z the equation will be always true..

I understood it as the later one.. hence i opted for Zero, bcoz if its ) the LHS = RHS.. and will always hold true...
Top
Legendary Member
Posts: 1153
Joined: Wed Jun 20, 2007 6:21 am
Thanked: 146 times
Followed by:2 members

by parallel_chase » Mon Jul 28, 2008 3:29 am
sudhir3127 wrote:Do we need to solve the eauation and find the values of X, y, z or the question mean for what values of X, y , Z the equation will be always true..

I understood it as the later one.. hence i opted for Zero, bcoz if its ) the LHS = RHS.. and will always hold true...
Well if you go by that way even the second option would hold true, x=1,z=1

xy+z=x(y+z)

y+1=y+1

On GMAT you cannot have 2 right answers, therefore option E is the correct.

I hope its clear.
Top
Post new topic Post Reply
• Page 1 of 1