Question

Which of the following is a rational number?
(a) $\sqrt{5}$
(b) 0.101001000100001...
(c) π
(d) 0.853853853...

Answer 1

Since, a number whose decimal expansion is terminating or non-terminating recurring is rational number.

So, 0.853853853... is a rational number.

Hence, the correct option is (d).