The image above represents P(not A).

To compute for P(not A), two essential parameters are needed and these parameters are **Number of Times in Which Event A Can Occur (x) **and

**Total Number of All Possible Outcomes (N).**

The formula for calculating P(not A):

**P(not A)** = ^{(N – x)} ⁄ _{N}

Where;

x = Number of Times in Which Event A can Occur

N = Total Number of All Possible Outcomes

Let’s solve an example;

Find the P(not A) when the number of times in which event A can occur is 7 and the total number of all possible outcomes is 11.

This implies that;

x = Number of Times in Which Event A can Occur = 7

N = Total Number of All Possible Outcomes = 11

**P(not A)** = ^{(N – x) }⁄ _{N}

P(not A) = ^{(11 – 7) }⁄ _{11}

P(not A) = ^{4 }⁄ _{11}

P(not A) = 0.36

Therefore, the **P(not A) **is **0.36.**

Continue reading How to Calculate and Solve for P(not A) | Probability