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Which base of numerical system have $\frac{1}{5} = 0.33333\ldots$?

I need assistance in solving this one.

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    http://www.mathsisfun.com/binary-decimal-hexadecimal-converter.html is worth a look. It offers decimal, binary and hex conversions. It might help you see the relationships, ex, enter binary .010101010101 and see what this is in decimal.2014-07-08

3 Answers 3