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Re: Division by zero [#permalink]
23 Aug 2013, 10:49

hey Madhu,

Yes, we can assume that y is not equal to zero as denominator cannot be zero. _________________

If I look absent-minded or insane, I am just living a dream of being successful. If you still wonder why I am like this, you have no idea how success tastes like!

Re: Division by zero [#permalink]
27 Aug 2013, 21:10

Expert's post

maaadhu wrote:

Sorry this might sound stupid but I have a question regarding division by zero.

I know division by zero is undefined.

For ex, In DS questions, if its given that x/y > 0. Can we assume that y is not equal to zero?

You wouldn't even need to assume. Official questions mention explicitly y/x = ... such that x \neq 0. If somewhere it is not mentioned, you can assume it.

Mind you, that means GIVEN yx = x^2 and NOT GIVEN x \neq 0, you cannot divide both sides by x. yx/x = x^2/x is incorrect.

You must do this: yx - x^2 = 0 x(y - x) = 0 x = 0 or y = x _________________

Re: Division by zero [#permalink]
30 Oct 2013, 12:06

maaadhu wrote:

Sorry this might sound stupid but I have a question regarding division by zero.

I know division by zero is undefined.

For ex, In DS questions, if its given that x/y > 0. Can we assume that y is not equal to zero?

yeah its an assumption in gmat that the denominator wont be zero ...in cases where there is some equation in the denominator the denominator will be specifically be pointed to a solution which can lead to a zero ..and in the question stem that possibility is generally refuted..

gmatclubot

Re: Division by zero
[#permalink]
30 Oct 2013, 12:06