A:I play games after school.
B:I play football after school.
C:I often play with my friends after school.
某商场为了吸引顾客,特设了一个有奖销售活动,办法如下:凡购物满100元者得奖券一张,多购多得,每10000张奖券为一个开奖组,特等奖1名,一等奖50名,二等奖100名,那么某顾客买了1000元的物品,那么他中特等奖的概率为( )
设复数z满足i﹣z=2﹣i,则z=( )