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Let A = { 1, 2, { 3, 4 }, 5 }. Which of...

Let `A = { 1, 2, { 3, 4 }, 5 }`. Which of the following statements are incorrect and why?
`{3, 4} ⊂ A`

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The correct Answer is:
as `{3,4}∈A`
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NCERT TAMIL-SETS-EXERCISE 1.3
  1. Examine whether the following statements are true or false: { a }∈ {...

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  2. Examine whether the following statements are true or false: { x : x ...

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  3. Let A = { 1, 2, { 3, 4 }, 5 }. Which of the following statements are ...

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  4. Let A = { 1, 2, { 3, 4 }, 5 }. Which of the following statements are ...

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  5. Let A = { 1, 2, { 3, 4 }, 5 }. Which of the following statements are ...

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  6. Let A = { 1, 2, { 3, 4 }, 5 }. Which of the following statements are ...

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  7. Let A = { 1, 2, { 3, 4 }, 5 }. Which of the following statements are ...

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  8. Let A = { 1, 2, { 3, 4 }, 5 }. Which of the following statements are ...

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  9. Let A = { 1, 2, { 3, 4 }, 5 }. Which of the following statements are ...

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  10. Let A = { 1, 2, { 3, 4 }, 5 }. Which of the following statements are ...

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  11. Let A = { 1, 2, { 3, 4 }, 5 }. Which of the following statements are ...

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  12. Let A = { 1, 2, { 3, 4 }, 5 }. Which of the following statements are ...

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  13. Let A = { 1, 2, { 3, 4 }, 5 }. Which of the following statements are ...

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  14. Write down all the subsets of the following sets {a}

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  15. Write down all the subsets of the following sets {a,b}

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  16. Write down all the subsets of the following sets {1,2,3}

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  17. Write down all the subsets of the following sets phi

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  18. How many elements has P(A), if A = φ?

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  19. Write the following as intervals : {x : x ∈ R, – 4 < x ≤ 6}

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  20. Write the following as intervals : {x : x ∈ R, – 12 < x < –10}

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