A relation R on a set S, defined as x R y if and only if y R x. This is an example of?
A. reflexive relation
B. symmetric relation
C. transitive relation
D. invalid relation
Answer: Option B
A. reflexive relation
B. symmetric relation
C. transitive relation
D. invalid relation
Answer: Option B
A. Inorder
B. Preorder
C. Postorder
D. Level-order
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