Question

any number that is divisible by 3 is also divisible by 9
find a counterexample to show that the conjecture is false
A.48
B.27
C.45
D.18

Answer 1

so all you would do is take each answer and try to divide it by both 3 and 9 which ever one does not divide evenly would be a false conjecture.
A. 48 does not divide out evenly

Answer 2

48÷3 =16
48÷9 = 5
45
---
0 3

Answer 3

48/9 is 5.3333