Junior Cycle · Probability
⏱ Tested in 1 exam question since 2023
Lesson 6 of 7
JCHL Probability 6: Miscellaneous
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- P(event happens) = 1 − P(event does NOT happen)
- 1 stands for all the possible outcomes (100%); subtract the part you do not want to get the part you do want
- This shortcut is very useful in harder "at least" type questions
Formula used
probability it DOES happen = 1 − probability it does NOT happen
Most recent exam questions
- 2023 Q5(c)
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