I am having problem in making relations for this question.
$S = \{1, 2, 3, 4\}, A = S \times S; (a,b) R (c,d)$ if and only if $ad = bc$.
I have made the following relations, but I am not sure if these are correct or not.
$R = \{(1,1), (2,2), (3,3), (4,4)\}$.
Please let me know what is the correct answer.
Thanks.