The relation 'is the father of' is________.
a) reflexive b) irreflexive
c) transitive d) symmetric
It is not symmetric because A is father of B=>B is son of A or B is a daughter of A,
it is not transitive because A is father of B, B is father of C=> A is grandfather of C.
Answer is b) irreflexive because A is not father of A.
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