To find the probability of not rolling a 3 on a regular number cube, we can start by looking at how a standard six-sided die works. Each face of the cube has an equal chance of landing face up, and there are a total of 6 faces: 1, 2, 3, 4, 5, and 6.
When rolling the die, the specific outcome of rolling a 3 has a probability of:
P(rolling a 3) = 1/6
Since we are interested in the probability of not rolling a 3, we can express this as:
P(not rolling a 3) = 1 – P(rolling a 3)
Substituting the probability of rolling a 3:
P(not rolling a 3) = 1 – (1/6) = 5/6
This means that when you roll a regular number cube, there’s a 5 out of 6 chance that you will not roll a 3. In percentage terms, this is approximately 83.33%.
So, to summarize:
- Total outcomes when rolling the die: 6
- Outcomes that are not 3: 1, 2, 4, 5, 6 (5 outcomes)
- Probability of not rolling a 3: 5/6 (or about 83.33%)