# What is Probability of Compound Events?

##### 1 Answer

Feb 2, 2015

It matters whether the events are independent or not.

**Example**

If you roll a die twice, the second roll is independent of the first, because a die doesn't have memory.

Probabilty of rolling two sixes

First:

Second:

Probability of two sixes means:

First is 6 **AND** second is 6:

Probability of rolling more than 4 (i.e. 5 **OR** 6) in one try:

**General rule**

If it's an **AND** situation multiply the chances

If it's an EITHER.. **OR** situation, you add