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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
268/n = 0.268 // - 0.268
268/n-0.268 = 0
268*n^-1 = 0.268 // : 268
n^-1 = 0.001
-1 < 0
1/(n^1) = 0.001 // * n^1
1 = 0.001*n^1 // : 0.001
1000 = n^1
n = 1000
n = 1000
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