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well guys i was doing some problems with series and i cam up with this problem, i think it belongs to combinatorics but i'll post it here.

How is defined the permutations, combinations and variatons of negative numbers. For example if you were required to find the combinations of -2 elements taken from a set of n elements. TO me this makes no sens?????

[tex]\left(\begin{array}{cc}-2\\&n)[/tex]

any help would be appreciated

p.s. sorry for my latex, but i do not know how to write this.

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