Write the following set in Roster form :
C = { x : x is a composite number and 5 ≤ x ≤ 21 }
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C = { x : x = 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21}
Hence, C = {6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21}.
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A = {x : x = y + 3, y ∈ N and y > 3}.
B = { p : p ∈ W and p2 < 20 }.
List the elements of the following set :
{ x : x2 - 2x - 3 = 0 }
{ x : x = 2y + 5 ; y ∈ N and 2 ≤ y < 6 }