Question

Let A = {2, 3, 4, 5} and B = {1, 3, 4}. If R is the relation from A to B given by a R b if "a is a divisor of b". Write R as a set of ordered pairs.

Answer 1

$\mathrm{Since}R=\left\{\left(a,b\right):a,b\in N:a\mathrm{is}\mathrm{a}\mathrm{divisor}\mathrm{of}b\right\}$

So, R = {(2, 4), (3, 3), (4, 4)}