Martha rolls a number cube with sides 1, 2, 3, 4, 5, and 6. What is the probability of NOT rolling a 3?

5 out of 6 chances Martha is not gonna roll a 3

Answer=5/6

Lets see ... When rolling a 6 sided dice, their are 6 potential outcomes

1,2,3,4,5,6

Of these 6 outcomes, 5 of them are NOT 3. So 5 of the 6 outcome will give you a number other than three.

P (not 3) = 5/6