How do you calculate 'at least probability'?

To calculate 'at least probability,' you typically focus on finding the probability of one or more favorable outcomes occurring in an event. The most efficient way to do this is to consider the complement of the event in question.

This means you first determine the probability of the event not occurring at all (i.e., the opposite). You can then subtract this probability from 1 to find the probability of the event occurring at least once. For example, if you are tossing a die and want to find the probability of rolling at least one 4 in three tosses, you would first calculate the probability of not rolling a 4 at all and then subtract that from 1.

This approach simplifies calculations, especially when dealing with multiple events and ensures that you are capturing all possible successful outcomes as opposed to calculating each possible successful outcome individually.