[
next
] [
prev
] [
prev-tail
] [
tail
] [
up
]
3.1.11
problem 13
P
(
X
=
a
)
=
∑
z
∈
Z
P
(
Z
=
z
)
P
(
X
=
a
∣
∣ ∣
∣
Z
=
z
)
=
∑
z
∈
Z
P
(
Z
=
z
)
P
(
Y
=
a
∣
∣ ∣
∣
Z
=
z
)
=
P
(
Y
=
a
)
.
[
next
] [
prev
] [
prev-tail
] [
front
] [
up
]