Which of the following is an example of the null set?
Set of odd natural numbers divisible by $2$.

  • A
    ${x : x \text{ is an odd natural number and } x \text{ is divisible by } 2}$
  • B
    ${x : x \text{ is an even prime number}}$
  • C
    ${x : x \text{ is a natural number, } x < 5 \text{ and } x > 7}$
  • D
    ${x : x \text{ is a point common to any two parallel lines}}$

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Similar Questions

Write the following set in roster form:
$B = \{x : x \text{ is a natural number less than } 6\}$

Which of the following pairs of sets are equal? Justify your answer.
$A = \{ n : n \in \mathbb{Z} \text{ and } n^2 \le 4 \}$ and $B = \{ x : x \in \mathbb{R} \text{ and } x^2 - 3x + 2 = 0 \}$.

The set $A = \{ x : x \in \mathbb{R}, x^2 = 16 \text{ and } 2x = 6 \}$ is equal to

State which of the following sets are finite or infinite:
$\{ x:x \in N \text{ and } x^2 = 4 \}$

The set $A = \{ x : x \in \mathbb{R}, x^2 = 16 \text{ and } 2x = 6 \}$ is equal to

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