Solution:
Given R={(a,b),(b,c),(b,d)}
In order to make it equivalence relation as per given set, R must be
{(a,a),(b,b),(c,c),(d,d),(a,b),(b,a),(b,c),(c,b), (b,d),(d,b),(a,c),(a,d),(c,d),(d,c),(c,a),(d,a)}
There already given so 13 more to be added.
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