Question 7:
Write the following intervals in set-builder form:
(i) (−3, 0)
(ii) [6, 12]
(iii) (6, 12]
(iv) [−23, 5)
Answer
(i) (−3, 0) = {x: x ∈ R, −3 < x < 0}
(ii) [6, 12] = {x: x ∈ R, 6 ≤ x ≤ 12}
(iii) (6, 12] ={x: x ∈ R, 6 < x ≤ 12}
(iv) [−23, 5) = {x: x ∈ R, −23 ≤ x < 5}
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