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What s the numerical value of 1/a + 1/b + 1/c ? 1) a+b+c =

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Manager
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What s the numerical value of 1/a + 1/b + 1/c ? 1) a+b+c = [#permalink]  05 Aug 2003, 04:12
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What s the numerical value of 1/a + 1/b + 1/c ?

1) a+b+c = 1;
2) abc = 1.
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[#permalink]  05 Aug 2003, 09:48
I might be falling for the Joe Bloggs answer here but:
C

given (2) gives us a common denominator if we were to require adding 1/each = 1
and (1) gives us the derived numerator = 1
Thus we have 1/1 as the answer.
Manager
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[#permalink]  05 Aug 2003, 10:16
how did u get the derived numerator as a+b+c? Shouldn't it be ab+bc+ca?
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[#permalink]  05 Aug 2003, 20:03
I will vote with Prashant.
E. None of the conditions are sufficient.
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[#permalink]  05 Aug 2003, 20:19
E. I tryed different numbers and got different answers.
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Re: DS practice #4 [#permalink]  06 Aug 2003, 01:44
Konstantin Lynov wrote:
What s the numerical value of 1/a + 1/b + 1/c ?

1) a+b+c = 1;
2) abc = 1.

Solution: Let's simplify the equation first. This leads us to (bc+ac+ab)/abc;
Neither statement one, not two gives us sufficient info to find values for the given equation. Combining two statements together, we get three variables and only two equations. Thus, E is the correct answer.
_________________

Respect,

KL

Re: DS practice #4   [#permalink] 06 Aug 2003, 01:44
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