Is 0.171717 an irrational number

Answer 1

Any number that you can completely write down using digits, plus a decimal point

or a fraction bar if you need them, is rational.

You wrote 0.171717 . If that's the whole thing, then you wrote down the whole thing

with digits and a decimal point, so it's rational.

(It happens to be the ratio of 57,239 to 1,000,000 .)