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Another Integer Question

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Source: — Data Sufficiency |
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by cramya » Sat Feb 14, 2009 5:16 pm
Stmt I mentions y but what we are asked to find does not. Please clarify.

Regards,
CR
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by mlaboda » Sat Feb 14, 2009 5:22 pm
My workbook doesn't provide any additional information, except that the answer is C.
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Re: Another Integer Question

by earth@work » Sat Feb 14, 2009 7:58 pm
mlaboda wrote:Plz provide an explanation. Tks!

Is (9^x)^3-2x = 1?
1. The product of x and positive integer y is not x.
2. x is an integer.
(1) x*y not equal to x means x is not = 0 OR y is not = 1; if x=0 then the cond would have been suff ! ...... insuff!
(2) x is integer..... no help..insuff

I also feel there is something missing in the problem!
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by ontopofit » Sun Feb 15, 2009 1:01 am
for C to be a correct answer as stated by mlaboda...

the question has to be -

Is (9)^(x(3-2x)) = 1?
for this equation to hold true the power should be 0 as 9^0 = 1

so x(3-2x) = 0; and x=0,3/2
1) x is not 0; insuff,as x may be or may not be 3/2.
2) x is an integer;insuff,as x can be 0.

taking both........x <> 0,and x<>3/2....so we can clearly say that the equation in question does not hold true.
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