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GREŽ Math: Function problem



 
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GRE Math: Function problem #1 (permalink) Sat Mar 17, 2007 5:41 am   GRE Math: Function problem
 

Dear Friends,

I am preparing for the GRE. I have to solve all these function problems and have no clue. I have provided a sample question and I will appreciate if someone can solve it for me and explain the rationale involved. My math education did not cover functions.

For all numbers n, n*= 32-n. Which is greater? (n*)* or n.

Thank you.
Albertnow
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Joined: 17 Mar 2007
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GRE Math: Function problem #2 (permalink) Tue Mar 20, 2007 14:08 pm   GRE Math: Function problem
 

Well:

n* + n = 32

So we'd have to solve for two variables... the exponential variable (*) and n.

Some real math wizard might be able to do this, but I'm calling it an ambiguous situation -- I need one of these variables, either * or n, in order to proceed.
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GRE Math: Function problem #3 (permalink) Thu Mar 22, 2007 15:44 pm   GRE Math: Function problem
 

I think that solution is "(n*)* = n "

n*=32-n
therefore, (n*)* = 32 - (n*) = 32 - {32 - n} = n

therefore, (n*)* = n

are you OK?
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