Question

Choose the counterexample that disproves the conjecture?

If a perfect square is odd, then its square root is multiple of 3.
4
9
25
81

Answer 1

Well all these choices are perfect squares...so we only want odd here so 4 is out

Now...we can see 9 is divisible by 3
we can see that 81 is divisible by 3

is 25 divisible by 3?

Answer 2

no

Answer 3

Right the square root of 25 is 5 which is definitely not a multiple of 3...and that would be your counterexample!

Answer 4

thanks