Maths puzzle 4



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NUMBERS

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        A  number  is a  mathematical object  used to  count ,  measure , and also  label . The original examples are the  natural numbers   1 ,  2 ,  3 ,  4 , and so forth. [1]  A notational  symbol  that represents a number is called a  numeral . [2]  In addition to their use in counting and measuring, numerals are often used for labels (as with  telephone numbers ), for ordering (as with  serial numbers ), and for codes (as with  ISBNs ). In common usage,  number  may refer to a symbol, a  word , or a  mathematical abstraction .
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