4試合中2試合勝つ→4C2
勝ちが2回→(1/3)^2
負けが2回→(1-1/3)^2=(2/3)^2
5試合目Aが勝つ→1/3
合わせて
4C2*(1/3)^2*(2/3)^2*1/3
(3)も似たような考え方
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4試合中2試合勝つ→4C2
勝ちが2回→(1/3)^2
負けが2回→(1-1/3)^2=(2/3)^2
5試合目Aが勝つ→1/3
合わせて
4C2*(1/3)^2*(2/3)^2*1/3
(3)も似たような考え方
Users viewing this question
are also looking at these questions 😉
