# Science Quiz / Mathematical Sets

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## Can you name the following mathematical sets given the defining property of each element in that set?

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Property:Mathematical Set:
The product of n(n-1)(n-2)(n-3)...(n-(n-1)), where n is any positive integer.
Any positive real number expressed as a fraction of 100.
Any positive integer equal to the sum of its positive divisors excluding the number itself.
Any number which is equal to n+(n-1)+(n-2)+...+(n-(n-1)), where n is any positive integer.
Any positive integer (although some people also include 0 as an element of this set).
Any positive integer that is divisible only by 1 and itself.
Any number which has two constituent parts - a real part and an imaginary part.
The product of any integer n, raised to the power of 2.
Any integer which is not evenly divisible by 2.
Any number which is the sum of the previous two numbers in the series beginning: 0,1...
Any real number less than 0.
Any number which is the sum of the previous two numbers in the series beginning: 2,1...
Any real number which cannot be expressed as a ratio of two integers.

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Created Feb 9, 2012
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