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# Integers vs. Numbers

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Intern
Joined: 06 Oct 2009
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Integers vs. Numbers [#permalink]  12 Oct 2009, 09:58
I feel so stupid for posting this but I figure that I am going to feel even stupider for not knowing. I was reading a GMAT Prep book yesterday and it was discussing exponents when I came across this sentence. "Let x and y be any positive numbers, and let r and s be any positive integers." I was under the impression that an integer was a whole number and they are referring to numbers as a whole number because they show examples. If any of you have the 11th edition of the GMAT Prep book it is on page 125. My question is... What is the difference between an integer and a number? By the way the sentence is written I am thinking that maybe there is a distinct difference.
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Manager
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Re: Integers vs. Numbers [#permalink]  12 Oct 2009, 10:13
Number is a very broad term.

In GMAT a number can be one of these :- whole number, natural number, integer, numbers with decimal, fractions, rational and irrational.

Here they just want to tell u that the number can have decimal values as well, negative and positive.
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Re: Integers vs. Numbers [#permalink]  12 Oct 2009, 20:19
Integer is just a whole number, it can be both positive and negative.

If it says it is number, you never know whether it is whole, decimal, or fraction.
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Re: Integers vs. Numbers [#permalink]  13 Oct 2009, 15:22
read this carefully and define sets with start elements, end elements and sample elements in between as far as possible. That itself will give you a good idea of definitions of the types of numbers in mathematics.
http://www.purplemath.com/modules/numtypes.htm
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Re: Integers vs. Numbers   [#permalink] 13 Oct 2009, 15:22
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