# If you roll a pair of dice, what is the probability of rolling either a single 3 or a sum that is an odd number?

##### 1 Answer

Nov 6, 2015

The probability is:

#### Explanation:

In this task we have to calculate the probability of sum of 2 events (i.e. rolling a single 3 **or** rolling an odd sum).

To do this we must use the following formula:

Event

Event

Event **and** an odd sum", so

Now we can use the first formula: