OCME · Bilingual mathematics & derivations

Concept derivation guides

299 concept teaching guides, separate from the 36,000 individual question derivations.

Concept guide

Counting phi(12) representative by representative

phi(12)=4, phi(1)=1, and here phi(3*4)=phi(3)*phi(4).

Euler totient function

derivation-mko-euler-totient-function-01