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Which is an irrational number
0.12
0.1257486
0.12121212
0.111111

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#not helpful# ;b
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111

None of the above. An irrational number is a number that cannot be expressed as a fraction and has an infinite number of decimal places that do not repeat. Examples of irrational numbers include pi (3.14159...) and the square root of 2 (1.414213...).

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