Flap, Flep, Flip and Flop are related to each other, but not incestuously.
Among the four are Flap's mother, Flep's brother, Flip's father and Flop's daughter, and the oldest and the youngest are of opposite sex.
One is a different sex from the other three: who?
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Submitted by pcbouhid
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Rating: 3.5556 (9 votes)
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Solution:
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Using the information in (2), Flap's mother and Flop's daughter are either the same person or different persons.
I) If the same person, then the partial situation can be represented as follows :
(Flop)----->(Flop's daughter; Flap's mother)----->(Flap)
II) If different persons, then we have :
(Flop)----->(Flop's daughter; ??)
and
(Flap's mother; ??)----->(Flap)
In (I), Flep's brother is either Flap or Flop. So Flip is Flap's mother and Flop's daughter, and Flip's father is either Flop or Flep.
Flip's father cannot be Flep because Flep's brother is either Flap or Flop. So, Flip's father is Flop.
Now, suppose Flep's brother is Flap. Then, from (1), Flep is a man, which contradicts (3). So Flep's brother is Flop. From (3), Flep and Flap are both women. So, Flop is the only male in (I).
In (II), Flep's brother and Flip's father must be the same person, and the only male, from (1). So Flop must be Flip's father and Flep's brother, wich means Flop is the only male in (II).
So, in any case, Flop is the only male.
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