Question

Is 0.121122111222 a repeating decimal

Answer 1

To be repeating, there has to be a group of digits that repeat over and over forever. Yes the 1s and 2s repeat, but not in a fixed way. If we had

0.1212121212
or
0.112211221122

then it would be a repeating decimal

Answer 2

Repeating means the numbers have a pattern but this one does not have a pattern so it is not repeating.