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Byju's Answer
Standard IX
Mathematics
Venn Diagram
If A, B are...
Question
If
A
,
B
are subsets of a sample space
S
, then
A
A
⊆
B
⇔
P
(
A
)
=
P
(
B
)
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B
P
(
A
)
≥
P
(
B
)
⇒
A
⊂
B
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C
A
⊂
B
⇒
P
(
A
)
≤
P
(
B
)
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D
A
⊂
B
⇒
P
(
A
)
≥
P
(
B
)
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Solution
The correct option is
B
A
⊂
B
⇒
P
(
A
)
≤
P
(
B
)
A
⊂
B
⇒
P
(
A
)
≤
P
(
B
)
Suggest Corrections
0
Similar questions
Q.
Assertion :If
P
(
A
/
B
)
>
P
(
A
)
then.
P
(
B
/
A
)
>
P
(
B
)
. Reason: If events A & B are dependent, then
P
(
A
/
B
)
=
P
(
A
∩
B
)
P
(
B
)
.
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.
If A and B are two events such that
i
P
A
=
1
3
,
P
B
=
1
4
and
P
A
∪
B
=
5
12
,
then
find
P
A
|
B
and
P
B
|
A
.
ii
P
A
=
6
11
,
P
B
=
5
11
and
P
A
∪
B
=
7
11
,
then
find
P
A
∩
B
,
P
A
|
B
and
P
B
|
A
.
iii
P
A
=
7
13
,
P
B
=
9
13
and
P
A
∩
B
=
4
13
,
then
find
P
A
|
B
.
iv
P
A
=
1
2
,
P
B
=
1
3
and
P
A
∩
B
=
1
4
,
then
find
P
A
|
B
,
P
B
|
A
,
P
A
|
B
and
P
A
|
B
.
[NCERT EXEMPLAR]
Q.
If P (A|B) > P (A), then which of the following is correct: (A) P (B|A) < P (B) (B) P (A ∩ B) < P (A).P (B) (C) P (B|A) > P (B) (D) P (B|A) = P (B)
Q.
If A and B are two events, then P (
A
∩ B) =
(a) P
A
P
B
(b) 1 − P (A) − P (B)
(c) P (A) + P (B) − P (A ∩ B)
(d) P (B) − P (A ∩ B)