If the probability of something happening is x, then the probability of it not happening is 1 - x.
Example
If the probability that it will rain is 3/8, then the probability that it will not rain is 1 - 3/8 = 5/8
The probability of the spinner landing on yellow is 3/8.
The probability of the spinner not landing on yellow is 1 - 3/8 = 5/8
Let's have a go at some questions now.
If the probability of you getting all the questions correct is 9/10, what's the probability that you don't get them all correct?
Could it be 1 - 9/10, which is 1/10?!
View the activity introduction for more information on the topic
Read the question aloud
Open the accessibility toolbar to change fonts and contrast, choose a different language, use a ruler and more
Question
Do you want to skip questions and finish?
Hold up, it looks like there may be an issue with your spelling. Why not try it again?
You need to check your answer before you proceed. Are you sure you want to skip?
Teacher explanation