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9th Maths Assignment Answers 2021
TN SCERT Full Answer Key
9th Maths Assignment Answers. 9th Standard TN SCERT Assignment Answers, 9th Maths Unit 1 TN SCERT Answer key 2021. 9th Standard All Subject TN SCERT Assignment Unit 1 Answers. TN SCERT Announced 1st to 12th All Subject Assignment Worksheets for Unit 1. Students Can Note that 9th Mathematics Unit 1 TNSCERT Assignment. 9th Tamil Assignment Answers, 9th Tamil Assignment Answers download PDF. 9th Maths Assignment Answers Unit 1 TNSCER Tamil Medium and English Medium.
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9th Assignment Answers TN SCERT
9th Standard Maths Unit 1 TN SCERT Assignment Answer key.
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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”
Answer : A={M,A,T,H,E,I,C,S}
3. If A={8, 10, 12, 14, 16, 18, 20} find n(A)
a. 4
b. 8
c. 7
d. 6
Answer : c. 7
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) = _________________
Answer : (A-B)∪(A-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
Answer : a). Associate Property
II. Short Answer:
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
III. Answer the following:
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?
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