33.2.3 Counting Probabilities with Permutations and Combinations
33.2 Classical Probability: Counting Your Way to the Answer
Point 3 of 4
33.2.3 Counting Probabilities with Permutations and Combinations
Core idea
Take the number of ways to draw two red balls over the number of ways to draw any two, bringing your earlier C and A straight in as numerator and denominator
Module goal. When every outcome is equally likely, turn finding a probability into the "counting" you just practiced
eastmath.com · 33.2 Classical Probability: Counting Your Way to the Answer · 33.2.3 Counting Probabilities with Permutations and Combinations