Grade 11 • Formula Set 7
Counting & probability tools: factorials, permutations, combinations, and the binomial probability formula.
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Why it matters
- Factorials power counting methods in probability.
- Permutations count arrangements where order matters.
- Combinations count selections where order doesn’t matter.
- Binomial probability models repeated yes/no outcomes.
- These formulas show up in stats, SAT-style questions, and real decisions.
- Once you know the “order matters?” test, you move fast.
Tip: Order matters → permutation. Order doesn’t → combination.
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01 — Permutation Formula