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bigchow
15.01.2020 •
Mathematics
Alice and bob take turns in rolling a fair dice. whoever gets "6" first wins the game. alice starts the game. what are the chances that alice wins?
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Ответ:
Probability of Alice win the game is![\frac{6}{11}](/tpl/images/0455/3375/82088.png)
Step-by-step explanation:
When a die is rolled then probability of getting 6 is![=\frac{1}{6}](/tpl/images/0455/3375/885a2.png)
So probability of winning the game![P(W)=\frac{1}{6}](/tpl/images/0455/3375/133ae.png)
Now probability of losing the game![P(L)=1-\frac{1}{6}=\frac{5}{6}](/tpl/images/0455/3375/fc472.png)
It is given that Alice starts the game
So either Alice win the game in 1st attempt or 3rd or 5th .....
So probability that Alice win the game![=P(W)+P(L)P(L)P(W)+P(L)P(L)P(L)P(L)P(W)+.....](/tpl/images/0455/3375/f445f.png)
So![P(w)=\frac{1}{6}+\frac{5}{6}\times \frac{5}{6}\times \frac{1}{6}+\frac{5}{6}\times \frac{5}{6}\times\frac{5}{6} \times \frac{5}{6}\times \frac{1}{6}......](/tpl/images/0455/3375/af2ac.png)
Now taking
common and applying sum of infinite GP ![P(W)=\frac{1}{6}\times \frac{1}{1-\frac{25}{36}}=\frac{1}{6}\times \frac{36}{11}=\frac{6}{11}](/tpl/images/0455/3375/3c482.png)
Probability of Alice win the game is![\frac{6}{11}](/tpl/images/0455/3375/82088.png)
Ответ:
6 is in the thousandths place
Step-by-step explanation: