Correct Answer - D
Let A and B denote the events defined below :
A=Getting a six in
6
t
h
6
or more trial.
B=Getting a six in
4
t
h
4
or more trial.
Required probability
=
P
(
A
/
B
)
=
P
(
A
∩
B
)
P
(
B
)
=
⇒
⇒
Required probability
=
P
(
X
≥
6
)
P
(
X
>
3
)
=
(
5
6
)
5
×
1
(
5
6
)
3
=
25
36
=
