Question

B is the brother of D. D is the sister of E. E is the brother of F. How is F related to B?

• A. Brother
• B. Sister
• C. Brother or sister
• D. Data inadequate
• E. None of the above

Answer 1

The correct option is C Brother or sister

$(+)B\stackrel{Brother}{\leftarrow }\stackrel{(-)}{D}\stackrel{Sister}{\leftarrow }\stackrel{(+)}{E}\stackrel{Brother}{\leftarrow }F$
So, it is clear that they are siblings but we do not know the gender of F. So, F is either the brother or the sister of B.