# What is Probability? Simple Definition and Examples

Probability is the measure of the likelihood or chance that a given event will occur.

## Some Important Key Concepts about Probability

The probability is expressed as a number between 0 and 1.

- When the probability is 1, the event will occur 100% of the time.

- The closer to 1, the more likely the event will occur.

- When the probability is 0, the event will never occur.

- The closer to 0, the less likely the event will occur.

## Probability of a Few Interesting Events

For example, we could find the probability for the following events:

Let A be the event that it will snow in Norway in December

Let B be the event that a die will land on 4

Let C be the event that the universe will disappear tomorrow.

P(A) = 1 since there is always snow in Norway in December

P(B) = 1/6 since there are 6 possibilities and 4 is one of them

p(C) = 0 because the universe will not disappear tomorrow.

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