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21、一个 1×8 的方格图形(不可旋转)用黑、白两种颜色填涂每个方格。如果每个方格只能填涂一种颜色,且不允许两个黑格相邻,共有_________种填涂方案。
共有 方案
22、某中学在安排期末考试时发现,有 7个学生要参加 7门课程的考试,下表列 出了哪些学生参加哪些考试(用√表示要参加相应的考试)。
最少要安排_________个不同的考试时间段才能避免冲突?
需要 个考试段