LEARN · EXPLAIN · REVISE
Counting principles
Read the idea, work independently, then explain what changed.
Each section contains concept explanations, three worked examples, ten graded exercises and teacher preparation.
6.1
Take the 15-question mixed assessment ↗Addition and multiplication counting principles
Count disjoint alternatives and sequential choices without overlap or omission.
6.2Permutations and combinations
Distinguish ordered selections, unordered sets and symmetry in arrangements.
6.3Binomial theorem
Use the general term to locate coefficients, constants and coefficient sums.