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In mathematics, when a letter is used to represent a number or set of numbers it is called an '''unknown'''.  This letter usually has a very specific range of values, unlike a [[variable]] which can be changed arbitrarily to alter the value of a [[function]] which acts on the variable.
 
In mathematics, when a letter is used to represent a number or set of numbers it is called an '''unknown'''.  This letter usually has a very specific range of values, unlike a [[variable]] which can be changed arbitrarily to alter the value of a [[function]] which acts on the variable.
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== See also ==
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[[Chance]]
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[[category:mathematics]]
 
[[category:mathematics]]
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