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Exam: Maharashtra State Board Class 9
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Q76
#76
Mathematics → Sets → Operations on Sets — Intersection and Union
·
Easy
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If M is any set, then write
M
∪
∅
M \cup \varnothing
M
∪
∅
and
M
∩
∅
M \cap \varnothing
M
∩
∅
.
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[QProb Q9 · Maharashtra State Board (Class 9) — Sets (Balbharati textbook, Part 1 Algebra)]
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Q77
#77
Mathematics → Sets → Venn Diagrams
·
Moderate
·
Has image
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Observe the Venn diagram and write the given sets
U
U
U
,
A
A
A
,
B
B
B
,
A
∪
B
A \cup B
A
∪
B
and
A
∩
B
A \cap B
A
∩
B
. In the diagram (universal set U): the region belonging to set A only contains
2
,
3
,
7
2, 3, 7
2
,
3
,
7
; the intersection
A
∩
B
A \cap B
A
∩
B
contains
1
,
5
1, 5
1
,
5
; the region belonging to set B only contains
8
,
9
,
10
8, 9, 10
8
,
9
,
10
; and outside both ovals (but inside U) are
4
,
11
,
13
4, 11, 13
4
,
11
,
13
.
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[QProb Q10* · Maharashtra State Board (Class 9) — Sets (Balbharati textbook, Part 1 Algebra)]
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Q78
#78
Mathematics → Sets → Number of Elements in a Set
·
Easy
Add
If
n
(
A
)
=
7
n(A)=7
n
(
A
)
=
7
,
n
(
B
)
=
13
n(B)=13
n
(
B
)
=
13
,
n
(
A
∩
B
)
=
4
n(A \cap B)=4
n
(
A
∩
B
)
=
4
, then
n
(
A
∪
B
)
=
n(A \cup B)=
n
(
A
∪
B
)
=
?
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[QProb Q11 · Maharashtra State Board (Class 9) — Sets (Balbharati textbook, Part 1 Algebra)]
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