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PS-GMAT prep

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Intern
Joined: 30 Jan 2007
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PS-GMAT prep [#permalink]  16 Aug 2007, 17:13
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Was wondering if anyone can help me understand this one???
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Director
Joined: 12 Jul 2007
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raising a number to a negative power is the same as taking the recipricol of that number.

so X^-1 = 1/x

so this becomes 1/A + 1/B = 1/A+B
Director
Joined: 14 Aug 2007
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eschn3am wrote:
raising a number to a negative power is the same as taking the recipricol of that number.

so X^-1 = 1/x

yah agreed

so this becomes 1/A + 1/B = 1/A+B

FYI=

1/A + 1/B = A+B/AB
SVP
Joined: 28 Dec 2005
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eschn3am wrote:
raising a number to a negative power is the same as taking the recipricol of that number.

so X^-1 = 1/x

so this becomes 1/A + 1/B = 1/A+B

thats surprising coming from you, eschn3am ! ill just assume it was a typo !
Director
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pmenon wrote:
eschn3am wrote:
raising a number to a negative power is the same as taking the recipricol of that number.

so X^-1 = 1/x

so this becomes 1/A + 1/B = 1/A+B

thats surprising coming from you, eschn3am ! ill just assume it was a typo !

haha, I was watching a movie when I responded to this and knew the math behind it but just tailored my answer to the one he chose (as opposed to the correct answer up there). Oop! my mistake!!
Senior Manager
Joined: 29 Nov 2006
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All explanations are correct...

Don't let the variable confuse you. treat 1/a the same as 1/2 and 1/b the same as 1/3.

You can't just add 1/2 + 1/3 in fraction format. You'll need to find the common denominator first then add.

The common denominator here is 6 (or a*b).

1*b/(a*b) is the same as 1/a.
1*a/(a*b) is the same as 1/b.

Add the two with the common denominator, you get (a+b)/(ab)
VP
Joined: 09 Jul 2007
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RedRoost.. has it been clear now. or u need further help!!!!
i hope i will encouter many of this level questions on actual test.
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