Question

Match roster forms with the set builder form.

(i) {P, R, I, N, C, A, L}
(ii) {0}
(iii) {1, 2, 3, 6, 9, 18}
(iv) {3, -3}

(a) {x : x is a positive integer and is a divisor of 18}
(b) {x : x is an integer and x2 – 9 = 0}
(c) {x : x is an integer and x + 1 = 1}
(d) {x : x is a letter of the word PRINCIPAL}

Answer 1

(i) {P, R, I, N, C, A, L}

(d) {x : x is a letter of the word PRINCIPAL}

(ii) {0}

(c) {x : x is an integer and x + 1 = 1}

Because x =0

(iii) {1, 2, 3, 6, 9, 18}

(a) {x : x is a positive integer and is a divisor of 18}

(iv) {3, -3}

(b) {x : x is an integer and x^2 – 9 = 0}

because(3)^2=(-3)^2=9