Question

Which is a counterexample to the conjecture?

Any number that is divisible by 3 is divisible by 9.



63


69



18


27

Answer 1

69 IS CORRECT

Explanation:

Answer 2

From the bottom up:

-- 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 ? Yes ! It's divisible by 3, but not by 9 .

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