## Answer :

-- Is 27 a counter example ? No. It's divisible by 3 and also by 9 .

-- Is 18 a counter example ? No. It's divisible by 3 and also by 9 .

-- Is 69 a counter example ?

**It's divisible by 3, but not by 9 .**

*Yes !*-- Is 63 a counter example ? No. It's divisible by 3 and also by 9 .