Question

Which of the following is an irrational number?
(a) $0.\overline{32}$
(b) $0.3\overline{21}$
(c) $0.\overline{321}$
(d) 0.3232232223...

Answer 1

(d) 0.3232232223...

Because 0.3232232223... is neither a repeating decimal nor a terminating decimal, it is an irrational number.