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EAMCET Engineering 2006 Solved Paper
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© examsnet.com
Question : 119
Total: 160
If
A
and
B
are two independent events such that
P
(
B
)
=
2
7
,
P
(
A
∪
B
c
)
=
0.8
, then
P
(
A
)
is equal to :
0.1
0.2
0.3
0.4
Validate
Solution:
∵
P
(
B
)
=
2
7
and
P
(
A
∪
B
c
)
=
0.8
P
(
B
c
)
=
1
−
2
7
=
5
7
We know that
P
(
A
∪
B
c
)
=
P
(
A
)
+
P
(
B
c
)
−
P
(
A
)
⋅
P
(
B
c
)
⇒
0.8
=
P
(
A
)
+
5
7
−
5
7
P
(
A
)
0.8
=
5
7
+
2
7
P
(
A
)
⇒
5.6
−
5
=
2
P
(
A
)
⇒
P
(
A
)
=
0.3
© examsnet.com
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