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Intern
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PS-GMAT prep [#permalink] New post 16 Aug 2007, 17:13
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Was wondering if anyone can help me understand this one???
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Director
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 [#permalink] New post 16 Aug 2007, 17:25
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
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 [#permalink] New post 16 Aug 2007, 18:24
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
:shock:

FYI=

1/A + 1/B = A+B/AB
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 [#permalink] New post 16 Aug 2007, 19:24
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


:shock: thats surprising coming from you, eschn3am ! ill just assume it was a typo ! :)
Director
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 [#permalink] New post 17 Aug 2007, 07:16
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


:shock: 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!!
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 [#permalink] New post 17 Aug 2007, 09:05
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)
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 [#permalink] New post 17 Aug 2007, 15:16
RedRoost.. has it been clear now. or u need further help!!!!
i hope i will encouter many of this level questions on actual test.
  [#permalink] 17 Aug 2007, 15:16
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