1.用1,2,3分别表示甲,乙,丙。
...........................1
..............2..........................3(传1次)
........1............3..............1.........2(传2次)
...2........3...1......2......2......3....1...3(传3次)
2.若球从甲传出,则传3次,回到甲的概率=1/4.
3.若球从甲传出,则传3次,回到乙的概率大于回到甲的概率..