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Math Help - Anyone here is good at Probability? I can't get the answer for this question...

  1. #1
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    Anyone here is good at Probability? I can't get the answer for this question...

    please helps me to solve the question 3c. The answer is 2/9 but i do not know how to get that...T_T
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  2. #2
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    Quote Originally Posted by daominhhai129 View Post
    please helps me to solve the question 3c. The answer is 2/9 but i do not know how to get that...T_T
    Let R be a right move: P(R)=\frac{2}{6}.
    Let L be a left move: P(L)=\frac{4}{6}.
    To end at B in three moves, we need RRL, RLR, or LRR.
    Each of those has the same probability and P(RRL)=\frac{2}{6}\cdot \frac{2}{6}\cdot\frac{4}{6}
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  3. #3
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    thank you very much..but my answer sheets say it's 2/9....i don't know whether my answer sheet is wrong or i do wrongly...
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  4. #4
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    Quote Originally Posted by daominhhai129 View Post
    my answer sheets say it's 2/9..
    No the answer sheet is correct.
    3P(RRL)=3\left(\frac{2}{6}\cdot \frac{2}{6}\cdot\frac{4}{6}\right)=\frac{2}{9}
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  5. #5
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    oh haha..thank you thank you..i'm so stupid..ya..now i can understand..thanks
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