for class VIII IX And also for junior section

1. ONLINE CLASS OF MATHEMATICS FOR
VII CLASS
TEACHER : SIR AHSAN
TOPIC : SET

2. APPLICATION OF SET
UNION:
Arrange all the elements in ascending
order. Symbol of union is (U).
INTERSECTION:
To take common. Symbol of
intersection is (⋂).
COMPLIMENT:
Subtract any set from universal set. The
recognition of compliment is ( ‘ ).

3. Q1 : If U = {1, 2, 3, 4, 5, 6, 7}
A = {1, 2, 3, 4, 5}
&
B = {3, 4, 5, 6, 7}
Find 1. AUB 2. BUA 3. A’ 4. B’
5. A⋂B 6. B⋂A

4. 1. AUB
Solution:
AUB = {1, 2, 3, 4, 5} U {3, 4, 5, 6, 7}
AUB = {1, 2, 3, 4, 5, 6, 7}

5. 3. A’
Solution:
A’ = U – A = {1, 2, 3, 4, 5, 6, 7} – {1, 2, 3, 4, 5}
A’ = {6, 7}

6. 5. A⋂B
Solution:
A⋂B = {1, 2, 3, 4, 5} ⋂ {3, 4, 5, 6, 7}
A⋂B = {3, 4, 5,}

7. HOME WORK FOR CLASS VII