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Byju's Answer
Standard IX
Mathematics
Probability
Let A and B b...
Question
Let A and B be two events for which P(A) = a, P(B) = b,
P
A
∩
B
=
c
,
then
P
(
A
∩
B
)
= __________________.
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Solution
For two events A and B P(A) = a, P(B) = b,
P
A
∩
B
=
c
Since
P
A
∩
B
=
P
B
-
P
A
∩
B
i.e
P
A
∩
B
=
b
-
c
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Similar questions
Q.
Assertion :If
P
(
A
/
B
)
=
P
(
B
/
A
)
. A, B are two non mutually exclusive events then
P
(
A
)
=
P
(
B
)
. Reason: For non mutually exclusive events
(
A
∩
B
)
≠
ϕ
and
P
(
A
/
B
)
=
P
(
A
∩
B
)
P
(
B
)
,
P
(
B
/
A
)
=
P
(
A
∩
B
)
P
(
A
)
.
Q.
Let A and B be two events such that
P
(
A
∪
B
)
=
P
(
A
∩
B
)
. Then,
Statement 1:
P
(
A
∩
¯
¯¯
¯
B
)
=
P
(
¯
¯¯
¯
A
∩
B
)
=
0
Statement 2: If
P
(
A
)
+
P
(
B
)
=
1
.
Q.
Let
A
and
B
be independent events with
P
(
A
)
=
0.2
,
P
(
B
)
=
0.5
. Then find:
(i)
P
(
A
|
B
)
(ii)
P
(
B
|
A
)
(iii)
P
(
A
∩
B
)
(iv)
P
(
A
∪
B
)
Q.
Let
A
and
B
be two events such that
P
(
A
∪
B
)
=
P
(
A
)
+
P
(
B
)
−
P
(
A
)
P
(
B
)
. If
0
<
P
(
A
)
<
1
and
0
<
P
(
B
)
<
1
, then
P
(
A
∪
B
)
′
is equal to
Q.
Let
A
,
B
and
C
be three events such that
P
(
A
)
=
0.3
,
P
(
B
)
=
0.4
,
P
(
C
)
=
0.8
,
P
(
A
∪
B
)
=
0.08
,
P
(
A
∩
C
)
=
0.28
,
P
(
A
∩
B
∩
C
)
=
0.09
. If
P
(
A
∪
B
∪
C
)
≥
0.75
, then
P
(
B
∩
C
)
satisfies
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