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Question from GMATPrep-01

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Source: — Problem Solving |
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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.
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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.
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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
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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
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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
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