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The decimal .66 repeating is equal to the fraction 2/3.
Expressed as a fraction, 0.2 recurring (that is, 0.2222...) is equal to two ninths or 2/9.
The answer will depend on which string is repeating. That is, is the number meant to be 0.838383... or 0.833333... ?
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9 repeating = infinity. If you mean 0.9999... repeating as a fraction, that is equal to 1. Proof: 1/3 = 0.3 repeating (0.3333...) 2/3 = 0.6 repeating (0.6666...) 1/3 + 2/3 = 3/3 = 1 0.3333... + 0.6666... = 0.9999... 0.9999... = 1 End of Proof: