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Understanding Probability Calculations

Basic Probability

  • Values between 0 and 1
  • 0 = impossible event
  • 1 = certain event
  • Example: P(heads) = 0.5

Combinations & Permutations

  • nCr: Order doesn't matter
  • nPr: Order matters
  • n: Total items available
  • r: Items being chosen

Conditional Probability

  • P(A∩B) = P(A) × P(B)
  • Events must be independent
  • Both probabilities 0-1
  • Used in decision trees