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Question

Let A={1,2,3,4,6} and R be the relation on A defined by {(a,b):a,bA ,b is exactly divisible by a}
(i) Write R in roster form
(ii) Find the domain of R
(iii) Find the range of R

Solution
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A={1,2,3,4,6}
R={(a,b):a,bA,b is exactly divisible by a}
(i) R={(1,1),(1,2),(1,3),(1,4),(1,6),(2,2),(2,4),(2,6),(3,3),(3,6),(4,4),(6,6)}
(ii) Domain of R={1,2,3,4,6}
(iii) Range of R={1,2,3,4,6}

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