在一个袋装有五个除数字外其它完全相同的小球面上分别标有这5个数从中任摸一个球，球面数字是奇数的概率是
某联欢会上有一个有奖游戏则如下有5张纸牌背面都是喜羊羊头像正面有2张是笑脸其余3张是哭脸现将5张纸牌洗匀后背面朝上摆放到桌上若翻到的纸牌中有笑脸就有奖没有笑脸就没有小芳获得一次翻牌机会她从中随机翻开一张纸牌小芳得奖的概率是
下列事件是必然事件的是
随意掷两个均匀的骰子，朝上面的点数之和为6
抛一枚硬币，正面朝上
个人分成两一定有个人分在一组
4阅读对人成长的影响是很大的希望中学共有名学为了了解学生课外阅读的情
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