Question

Let A = {x : 1 < x < 3}, B = {x : 1 < x ≤ 3},

C = {x : 0 < x < 3}, D = {x : 1 ≤ x < 5} and

E = {x : 1 ≤ x ≤ 5}

(i) Write the above sets as intervals.
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Answer 1

Note : e means belongs to

A : x e (1, 3)
B : x e (1, 3]
C : x e (0, 3)
D : x e [1, 5)
E : x e [1, 5]