Q10 of 65 Page 67

Let A = {1, 2, 3, 4, 6} and R = {(a, b) : a, b ϵ A, and a divides b}.

(i) Write R in roster form.


(ii) Find dom (R) and range (R).


Given: A = {1, 2, 3, 4, 6}


(i) R = {(a, b) : a, b ϵ A, and a divides b}


R is Foster Form is,


R = {(1, 2), (1, 3), (1, 4), (1, 6), (2, 2), (2, 4), (2, 6), (3, 3), (3, 6), (4, 4), (6, 6)}


(ii) Dom(R) = {1, 2, 3, 4, 6}


Range(R) = {2, 3, 4, 6}


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