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kayleigh88
22.10.2019 •
Mathematics
There are 100 equally spaced points around a circle. at 99 of the points, there aresheep, and at 1 point, there is a wolf. at each time step, the wolf randomly moves eitherclockwise or counterclockwise by 1 point. if there is a sheep at that point, he eats it.the sheep don’t move. what is the probability that the sheep who is initially oppositethe wolf is the last one remaining?
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Ответ:
we have![p_{51} = \frac{1}{100}](/tpl/images/0340/1813/1c943.png)
Step-by-step explanation:
considering circle with 100 points on it and then placing the wolf on one and sheep on rest.
pi = P( sheep on i-th spot is eaten at last}
As in the question we need to find probability of sheep opposite to the wolf, so p_{51}. observe each last spot is replaced by i-1 after eating
Byy LOTP we know thta![pi = \frac{1}{2}pi-1 + \frac{1}{2}pi + 1, i \epsilon {2,... 99}](/tpl/images/0340/1813/4022f.png)
also these pi need to satisfy
some sheep is eaten at last. Distribution is
satisfies above equation, therefore we have![p_{51} = \frac{1}{100}](/tpl/images/0340/1813/1c943.png)
Ответ:
There are five different ways, in which we can arrange the photos.
Step-by-step explanation:
There are five different ways to arrange the photos.
1. 5 photos in each 4 rows.
2. 4 photos in each 5 rows.
3. 2 photos in each 10 rows.
4. 10 photos in each 2 rows.
5. 20 photos in a single row.