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9th Standard Maths Unit 1 TN SCERT Assignment Answer key.

9th Tamil TN SCERT Unit 1 Answers

• Class:9
• Subject: MATHEMATICS
• Unit 1 - Set Theory
Part- A
I. 1 Mark Questions :

1. Consider the set A={10, 15, 20, 25}. Fill in the blanks with the appropriate symbol ∈ or €

i) 10_________ A            ii) 23 _________ A

Answer: i) 10 ∈ A          ii) 23 € A

2. Write set of letters of the following word in  Roster Form

“MATHEMATICS”

3. If A={8, 10, 12, 14, 16, 18, 20} find n(A)

a. 4
b. 8
c. 7
d. 6

4. If A={4, 5, 6}and B={3, 5, 7} (A∩B)
a. { 5 }
b. { 4 }
c. { 5, 6 }
d. { 5, 7 }
Answer : a. { 5 }

5.  Which of the following is correct?
a. ∅⊂ { a, b }
b. ∅∈ { a, b }
c. {a} ∈ { a, b }
d. a ∈ { a, b }
Answer : a. ∅⊂ { a, b }

6. Which of the following is correct Wrong?
a. { 8 } ∈ { 1, 2, 3, 7 }
b. { 8 } € { 1, 2, 3, 7 }
c.  7 ∈{ 1, 2, 3, 7 }
d. { 7 } € { 1, 2, 3}
Answer: a. { 8 } ∈ { 1, 2, 3, 7 }

7. Which of the following is true?
a. A-B=(A∩B)
b. A-B=B-A
c. (A∪B)´ = A´∪B´
d. (A∩B)´ = A´∪B´
Answer : d. (A∩B)´ = A´∪B´

8. If A and B are disjoint sets then n(A∪B)  = n(A) + n(B). This statement is
Answer : a. True                 b. False

9.  Fill  in  the  blank   A-  (B∩C)  = _________________

10.  For  any  two  sets  A  and  B

i).  A∪B  =  B∪A                      ii).  A∩B=  B∩A  this    property  is   .
a).  Associate  Property              b).  Distributive  Property
c).  Commutative  Property        d).  None  of  these

Part-  B
1.  If  A={2,5,7,8,9}  and  B=  {7,8,10,11}  find  A ∆ B

2.  Find  the  Number  of  subsets  &  the  number  of  proper  subsets  of  a  set  A  ={x,y,z,p,q}. .

3.  Write  the  set  of  letters  of  the  following  words  in  Roster  form,
i).  ASSIGNMENT
ii).  TEACHER

4.  A={1,2,5,7,9},  Q={2,3,5,9,11},  R={3,4,5,7,9}  and  S={2,3,4,5,8},  then  find
i).  (P∪Q)  ∪  R
ii).  (Q∩S)∩R

5.  If  n(A)  =  20,  n(B)  =  50,  n(A∪B)  =  60  and  n(B´)  =  20,  find  n(A∩B)  and  n(U)

Part-  C

1.  Let  X={a,  e,  i,  o,  u}and  Y={a,  g,  o,  f}.  Verify  that    n(A-B)  =  n(A)  -  n(A∩B)

2.  Out  of    500  Car  owners    investigated,  400  owned    Car  A  and  200  Owned  Car  B,  50  Owned   both  A  and  B  Cars.  Is  this  data  Correct?

1. 