Topic 3 · Counting & Probability

Counting techniques

• 🔒

  Complementary Counting

  ~13 min·practice inside

  Sign up
• 🔒

  Stars and Bars

  ~14 min·practice inside

  Sign up
• 🔒

  Inclusion–Exclusion

  ~14 min·practice inside

  Sign up
• 🔒

  Pigeonhole Principle

  ~14 min·practice inside

  Sign up
• 🔒

  Combinatorial Casework

  ~16 min·practice inside

  Sign up

Counting principles, perms & combs

Finish every section in Chapter 1 to unlock.

• 🔒

  Sum & Product Rules

  ~15 min·practice inside
• 🔒

  Permutations & Combinations

  ~17 min·practice inside
• 🔒

  Generating Functions

  ~20 min·practice inside

Probability

Finish every section in Chapter 2 to unlock.

• 🔒

  Probability

  ~16 min·practice inside
• 🔒

  Conditional Probability & Markov Chains

  ~18 min·practice inside
• 🔒

  Mean, Median & Mode

  ~14 min·practice inside
• 🔒

  Expected Value & Linearity of Expectation

  ~18 min·practice inside