题目

A tiny Alaska village has experienced a boom in tourism in recent years as polar bears spend more time on land than on Arctic sea ice.More than 2,000 people visited the northern Alaska village of Kaktovik in 2018 to see polar bears in the wild. The far north community lies in an area where increasingly higher temperature has sped up the movement of sea ice, the primary habitat(栖息地)of polar bears. As ice has gradually moved to deep water beyond the continental shelft more bears are remaining on land to look for food.Polar bears have always been a common sight on sea ice near Kaktovik, but分别把带有指针的圆形转盘A、B分成4等份、3等份的扇形区域，并在每一个小区域内标上数字（如图所示）．欢欢、乐乐两个人玩转盘游戏，游戏规则是：同时转动两个转盘，当转盘停止时，若指针所指两区域的数字之积为奇数，则欢欢胜；若指针所指两区域的数字之积为偶数，则乐乐胜；若有指针落在分割线上，则无效，需重新转动转盘．（1）试用列表或画树状图的方法，求欢欢获胜的概率；（2）请问这个游戏规则对欢欢、乐乐双方公平吗？试说明理由．