Which is an irrational number

Question

0.12
0.1257486
0.12121212
0.111111

Answer 1

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...).

Answer 2

#not helpful# ;b