China-friendly mirror (cn.improject.org). YouTube may fail on some mainland networks — other resources still work. Global site

Mainland mobile carriers often block or throttle Cloudflare Workers. Reliable phone access needs China CDN (e.g. EdgeOne) and ICP备案 — this mirror is not yet listed on beian.miit.gov.cn.

CIE bank

3,782 topic questions · catalog v312855 Additional Maths 0606 · 2,927 International Maths 0607Every question has a hand-checked walkthrough0607 Core 1,434 (P1/P3/P5) · Extended 1,493 (P2/P4/P6)0607 mix · P1 737 · P2 653 · P3 504 · P4 510 · P5 193 · P6 3303,782 topic questions · catalog v312855 Additional Maths 0606 · 2,927 International Maths 0607Every question has a hand-checked walkthrough0607 Core 1,434 (P1/P3/P5) · Extended 1,493 (P2/P4/P6)0607 mix · P1 737 · P2 653 · P3 504 · P4 510 · P5 193 · P6 330

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0606 · March 2025 · Paper 2 · V2 · Q4

Q4 · Permutations and combinations

Permutations and combinations

Question