3 Elements of Sℕ that are finite sets? (Natural Numbers)

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So i have

Sℕ = P(ℕ)

1. I need 3 elements of Sℕ that are finite sets. My idea:

Sℕ = {x | x < 4) 

does that work?

2. I need to write down an element of Sℕ that is an infinite set.

Well, ℕ itself is already infinite ℕ=(1, 2,3,4,5......n)

So my answer would be:

Sℕ = {x | x €  ℕ}

Correct? If not, would you like to correct me?

Thanks in advance!