回复：Problem 6

来源: 于 2009-07-27 18:18:33 [旧帖] [给我悄悄话] 本文已被阅读：次

Choosing a1, a2, …, a(n) such that a1+a2+…a(n) is not equal to b(n-1) is not enough to apply the induction. If b(n)