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Re: In the GMAT world, is 0 considered to be a multiple? [#permalink]
10 Aug 2007, 08:56

TheToastedBread wrote:

Apologies guys, a very basic query

In the GMAT world, is 0 considered to be a multiple of an integer?

eg: Would GMAT say that 0 is a multiple of 5? Or that 0 is a multiple of 6?

Many Thanks, TheToastedBread

mathematics says 0 is a multiple of five. the GMAT does not invent math truths. the only interesting thing you should note is that sqroot(x^2)=|x| and not +/- x.

instead -sqrt(x^2)= -x

not sure why they make the distinction, as i've never run across that before.

0 is not a multiple of anything. Have a calculator? Put in any integer divided by 0. Remember, multiple = divisor (same thing).

if you do that your calculator should read 'error' or 'undefined' because it is.

So to answer your question. How many multiples are there of 5? There are only 2, 1 and 5, making it a prime number.

I think you're confusing multiples with factors. The multiples of 5 are 5, 10, 15, 20,.......... The factors of 5 are 5 and 1. Factors=divisors. Since 5x0=0, it makes sense to me that 0 could be a multiple. But I don't know if that is true mathematically or if GMAT considers 0 a multiple.