Question

Writethe following intervals in set-builder form:

(i) (–3,0)

(ii) [6,12]

(iii) (6,12]

(iv) [–23,5)

Answer 1

(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}