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Q.

If 𝐴 = {𝑥: 𝑥 ∈ 𝑁; 𝑥 ≤ 0} , then
 

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a

  𝐴 = {0} 

b

  𝐴 = 0 

c

  𝐴 = 𝜙

d

  𝐴 = {𝜙} 

answer is D.

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Detailed Solution

𝜙 = null set 

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