Chatty reference · stats1 week 5

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2026-08-16

25. Stats W5 — Counting

Concepts:

Factorial:

n!=n(n-1)(n-2)\cdots1

Use when alternatives are mutually exclusive:

N=N_1+N_2+\cdots

Use for sequential choices:

N=N_1N_2\cdots

The real skill is recognizing whether a problem is additive or multiplicative.

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