Answer Posted / mithilesh kumar

Parenthesis are used to define the sequence or priority of
execution of operations which is useful in infix notation.
Whereas we have already taken
the consideration of order of execution of operands during
the time of conversion to
prefix or postfix form.These orders are maintained with
the help of Stack
i.e. Last in First out. So we donot need parenthesis in
prefix and postfix notions.

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