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DS: Number properties

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DS: Number properties

by beater » Fri Sep 12, 2008 3:11 pm
If rs is not equal to zero, is 1/r + 1/s = 4?

1. r + s = 4rs
2. r = s
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by ddm » Fri Sep 12, 2008 3:59 pm
IMO- A

Whats the OA?
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Re: DS: Number properties

by gmat2010 » Fri Sep 12, 2008 4:32 pm
beater wrote:If rs is not equal to zero, is 1/r + 1/s = 4?

1. r + s = 4rs
2. r = s
First simplify the question.

1/r + 1/s = 4
(s+r)/sr = 4

r+s = 4rs

So the question is asking is R + S = 4RS ???

1) Gives you exactly that.
2) try plugging in couple of values. r and s can be anything and does not have to equal 4 so it's not sufficient.

therefore, A.
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by aj5105 » Fri May 08, 2009 8:34 am
(A)
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