“第一次不动，第二次移到点B”、“第一次移到C或D，第二次移到B”；
所求概率为P＝
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（2）“投掷3次骰子，棋子恰巧在顶点B”包含三种情况：
“三次中棋子恰移动一次”、“三次中棋子恰移动两次”、“三次中棋子恰移动三次”
所求概率为P＝3•(
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