Question

Given the sets A = {1, 3, 5}, B = {2, 4, 6} and C = {0, 2, 4, 6, 8}, which of the following may be considered as universal set (s) for the three sets A, B, and C. 

(i) {0, 1, 2, 3, 4, 5, 6} 

(ii) ϕ {0,1, 2,3,4,5, 6, 7, 8, 9,10} 

(iii) {0,1,2,3,4,5,6 7, 8, 9,10} 

(iv) {1, 2,3, 4, 5,6,7,8}

Answer 1

Here universal set

The number b - a is called the length of any of the intervals (a, b), [a, b], [a, b] or [a, b].