2 scenarios for q2

来源: 于 2012-04-12 11:01:15 [旧帖] [给我悄悄话] 本文已被阅读：次

1. 1st position (million-th) is one of the pairs

2. 1st position is NOT one of the pairs

from here, it's better to ask you son/daugher to practice for this one -- haha!!