The Fig 2.7 shows a relationship between the sets P and Q. Write this relation
(i) in set-builder form (ii) roster form.
What is its domain and range?
Given:
As we see in given figure: P = {5,6,7}, Q = {3,4,5}
(i) Hence the relation in set builder form, R = {(x, y): y = x-2; x Є P}
or R = {(x, y): y = x-2; for x = 5, 6, 7}
(ii) And the relation in roaster form, R = {(5,3), (6,4), (7,5)}
As Domain of R = set of all first elements of the order pairs in the relation.
⇒ Domain of R = {5, 6, 7}
Range of R = set of all second elements of the order pairs in the relation.
⇒ range of R = {3, 4, 5}.
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