心算试解

来源: 于 2026-04-12 03:30:58 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

17 (when I=4)

Iteration method,  ith fold/cut, numbers of rope sections:

N(I)=2*N(i-1)-1,  N(0)=2  (two ends)

Or  N(i) = I²+1 ( without iteration)