Write {x: x = 3n, n ∈ w, n < 5} in roster form.
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n ∈ w, n < 5 , So n = 1 , 2 , 3 , 4
Now X = 3(1), 3(2), 3(3), 3(4)
So, In roaster Form it Will be { 3,6,9,12 }