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Let M be the set of men and R is a relat...

Let M be the set of men and R is a relation "is son of" defined on M. Then, R is (a) an equivalence relation (b) a symmetric relation (c) a transitive relation (d) None of these

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Here, the relation is `'` is son of `'`.
Let, `a` is an element in `M`.
Then, `a` can not be a son of `a`. So, given relation is not a symmetric relation.
Now, let `a` is a son of `b` and `b` is a son of `c`, then `a` is not a son of `c`.
So, this relation is not a transitive relation.
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