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**Probability**is simply the

**likelihood of an event happening**.

**It can be expressed in the following ways: **

- Equal Probability
- Likely Probability
- Unlikely Probability
- Certain Probability
- Impossible Probability

## Equal Probability

**Example 1**

There are 2 pens in a bag: one red and one blue. Since there is one of each, the likelihood of picking a red or a blue pen is **equal**, therefore the probability is equal.

**Example 2**

There are 2 balls in a bag: one purple and one blue. Since there is one of each, the likelihood of picking a purple or a blue ball is **equal**, therefore the probability is equal.

## Likely Probability

**Example 1**

Here we have 3 pens: 2 red, 1 blue. Since we have more red pens, the probability of picking out a red **is higher than (likely)** that of picking out a blue.

**Example 2**

**higher than (likely)**that of picking a blue or a green ball, since there are more red than any other colored ball in the set. Notice that the total number in the set changes as well. The probability of picking out a red ball would be

**3 out of 6**or

## Unlikely Probability

**Example 1**

**less likely (unlikely)**that you would pick out a blue pen, since there are more red pens than blue ones. The probability of picking out blue would be written as

**1 out of 3**, or

**1**

**3**

**.**

**Example 2**

**is lower than (unlikely)**the likelihood that they will pick a red or a green ball because there is only one blue while there are two red and two green. The probability of picking out a blue ball would be written as

**1 out of 5**or

**1**

**5**

## Certain Probability

The word **certain** means that an event will definitely happen without a doubt.

**Example 1**

If we had a set of all blue pens, we could say that it is **certain** that we would pick out a blue pen from this set, since this is the only option.

**Example 2**

If we had a set of all red balls, we could say that it is **certain** that we would pick out a red ball from this set, since this is the only option.

## Impossible Probability

Impossible means that there's no way that event will happen.

**Example 1**

We can say that it is **impossible** that a green pen will be picked out because there are no green pens in this set.

**Example 2**

Here, we can say that it is **impossible** that a black ball will be picked out because there are no black balls in this set.

**Probability of happening an event is always between 0 and 1.**

## Practice with a die

Jenny rolls a six-sided die. The six sides of the die have the numbers 1 - 6 written on them. For each of the following, state if the probability is **certain, probable, unlikely, or impossible**.

**Probable Probability **

**Jenny will roll a number greater than 1:**

There are 6 numbers that might be rolled. 5 of them are greater than 1. Because most of the numbers are greater than 1, it is **probable** that Jenny will roll a number greater than 1.

**Certain Probability **

**Jenny will roll a number less than 10:**

There are 6 numbers on the die. All 6 of them are less than 10. Because all of the numbers are less than 10, it is **certain** that Jenny will roll a number less than 10.

**Impossible Probability **

**Jenny will roll a number greater than 6:**

There are 6 numbers on the die. None of the numbers are greater than 6. Because none of them are greater than 6, it is **impossible** that Jenny will roll a number greater than 6.

**Unlikely Probability **

**Jenny will roll a number less than 2:**

There are 6 numbers on the die. Only 1 of those numbers is less than 2. Because most of the numbers are **NOT** less than 2, it is **unlikely** that Jenny will choose a number that is less than 2.

## Probability

- Probability is simply the likelihood of an event happening.
- It can be expressed in the following ways:
- Equal Probability
- Likely Probability
- Unlikely Probability
- Certain Probability
- Impossible Probability