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This is a problem for anything that uses machine precision floats, e.g. Mathematica, Matlab, C, etc. Consider the simpler example $1/10$. In base 10, this fraction has the finite decimal expansion $$ 1/10 = 0.1 $$ But your machine would store this number (and all floats) in binary. The problem is, in binary $1/10$ has the infinite decimal expansion $$ 1/10 ...

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