The number 1.112123123412345... is a/an:

Correct option is D

Given:
The number = 1.112123123412345.......
Solution:
The rational numbers iSolution:n their Decimal expansion have two forms.
1) Terminating Decimal Expansion
2) Non-terminating recurring decimal expansion
Otherwise, the number is irrational.
The given number is non-terminating, So the number 1.112123123412345....... is an irrational number.