1
2
P
?
Solution: (1) The number of methods for randomly selecting 2 papers from 50 papers is as follows
The
1
2
P
?
Solution: (1) The number of methods for randomly selecting 2 papers from 50 papers is as follows
The number of ways to select two papers in the same area is as follows
Therefore, the probability that two papers are selected from the same region is:
(2)∵ , , ?
1
2
P
The distribution list is