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

Redeem

Question from GMATPrep-01

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Problem Solving |
User avatar
Legendary Member
Posts: 2134
Joined: Mon Oct 20, 2008 11:26 pm
Thanked: 237 times
Followed by:25 members
GMAT Score:730

Re: Question from GMATPrep-01

by logitech » Sun Nov 09, 2008 9:02 am
rabab wrote:can anyone solvethis? i got the answer C.

https://img252.imageshack.us/my.php?imag ... 364sy7.jpg
why don't you post your calculation for the Statement III ? So we can see where you are making a mistake.
LGTCH
---------------------
"DON'T LET ANYONE STEAL YOUR DREAM!"
Top
User avatar
Legendary Member
Posts: 871
Joined: Wed Aug 13, 2008 7:48 am
Thanked: 48 times

by stop@800 » Sun Nov 09, 2008 10:33 am
you are facing problem with C

You do it with numbers or variables
after solving you will get same value for left expr and for right expr.

Just solve the equations completely.
Top
Legendary Member
Posts: 940
Joined: Tue Aug 26, 2008 3:22 am
Thanked: 55 times
Followed by:1 members

IMO C

by iamcste » Sun Nov 09, 2008 12:40 pm
C must be right

a+b+c-ac-bc not equal to a+b+c-ab-bc
Top
Legendary Member
Posts: 574
Joined: Sun Jun 01, 2008 8:48 am
Location: Bangalore
Thanked: 28 times

by vishubn » Sun Nov 09, 2008 4:59 pm
a*b= a+b-ab

a=1
b-2
c=3

A) 1+2-2=2+1-2
true

B)1*0=1+0-0
true

C)RHs=(1)*3
1+3-3=1
LHS=0

EVen i get the same !! can nayone work on the thrid option???

Vishu
Top
Legendary Member
Posts: 1035
Joined: Wed Aug 27, 2008 10:56 pm
Thanked: 104 times
Followed by:1 members

by scoobydooby » Mon Nov 10, 2008 2:41 am
one can identify the commutative and associative properties of multiplication by looking at the choices, so I and III would hold

ab=ba (commutative)
a*(b*c)=b*(a*c)=c*(a*b) etc (associative)

and by working out II only, (a*0)=a+0+0 also holds
or all I,II,III
Top
Post new topic Post Reply
• Page 1 of 1