Loading…
Loading…
When a problem asks about a hundred of something, do two, three and four first. The small cases reveal the pattern or the reason, and they are cheap. This is the single most reliable way into a five-point problem you do not immediately see.
Saved in this browser only. No account, nothing sent anywhere.
No indexed official paper question has been tagged with CFT-03 yet. The index grows one paper at a time, and it records only question numbers, point values and our own skill tags — never the problems themselves.