Year 10 / Grade 10 • Daily Maths Drill
Probability
Solve multi-step probability problems using sample spaces, complements and compound events.
8 questions • 240-question rotating bank • 30 different sets before a full cycle repeats
8Questions
240Question bank
0Best score
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Probability
Use tree diagrams or organised sample spaces to avoid missing outcomes.
Key ideas
- sample spaces
- complements
- independent events
- conditional ideas introduction
- experimental probability
Formula / rule: P(not A)=1−P(A); independent stages multiply.
Worked example: P(two heads)=1/2×1/2=1/4.
Common trap: Add probabilities for mutually exclusive alternatives; multiply along independent stages.
Key words
sample space — all possible outcomes
complement — event not occurring
independent — one event does not change the other's probability
compound event — multiple-stage event
relative frequency — experimental proportion
How to use this drill: review the short notes when learning, then close them on later attempts and practise from memory. The rotating bank delays a full set repeat for 30 attempts on the same browser.