please helps me to solve the question 3c. The answer is 2/9 but i do not know how to get that...T_T

- Sep 14th 2009, 11:52 AMdaominhhai129Anyone 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

- Sep 14th 2009, 12:06 PMPlato
Let R be a right move: $\displaystyle P(R)=\frac{2}{6}$.

Let L be a left move: $\displaystyle P(L)=\frac{4}{6}$.

To end at B in three moves, we need RRL, RLR, or LRR.

Each of those has the same probability and $\displaystyle P(RRL)=\frac{2}{6}\cdot \frac{2}{6}\cdot\frac{4}{6}$ - Sep 14th 2009, 12:12 PMdaominhhai129
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...

- Sep 14th 2009, 12:20 PMPlato
- Sep 14th 2009, 12:22 PMdaominhhai129
oh haha..thank you thank you..i'm so stupid..ya..now i can understand..thanks