Math 425: Answers to practice problems for the first midterm exam
10! 4
10
/((2!)
5
20
10
)
6
5
(10!)
2
/20!
4
3
10/(20 19 18)
p
1
p
2
+ (1-
p
1
)(1-
p
2
)
p
1
p
2
/(
p
1
p
2
+ (1-
p
1
)(1-
p
2
))
0.3
0
3/4
1/4
0.994
0.7/0.994