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Grade 9 Math Probability ยท Sets

Unit 7 ยท Essential Practice

Probability & Set Theory

20 carefully selected problems covering the most commonly missed concepts. Each question includes a memory key to help you explain the idea in your own words.

20 Questions
4 Topics
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๐Ÿ“‹ Quick Formula Reference

Basic Probability
\(P(A) = \dfrac{n(A)}{n(S)}\)
Complement
\(P(A') = 1 - P(A)\)
Addition Rule
\(P(A \cup B) = P(A)+P(B)-P(A \cap B)\)
Permutation
\({}_nP_r = \dfrac{n!}{(n-r)!}\)
Combination
\({}_nC_r = \dfrac{n!}{r!(n-r)!}\)
Mutual Excl.
\(P(A \cup B) = P(A)+P(B)\)

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