Question

Which of the following are empty set? Justify.
A= {x:x є N & 3 < x < 4}
B= {x:x є N & x2 =x}​

Answer 1

Answer:

A = { x ∶ x ∈ N and 3 < x < 4 } is an empty set, because, there is no natural number which is less than 4 and greater than 3, simultaneously.Read more on Sarthaks.com - https://www.sarthaks.com/1037747/which-of-the-following-are-empty-sets-justify-a-x-x-n-and-3-x-4?show=1037749#a1037749

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Answer 2

Answer:

$a = {0 mean \: empty \: set} \\ b = \: 1 \: so \: not \: empty \: set$