Question 141
It is known that male Martians always tell the truth, while female Martians always lie; on the contrary, male Venusians lie and Venusian women always tell the truth. A spaceship full of Martians and Venusians lands; at the immigration office two of the occupants, Ark and Bark, make the following statements:
Ark: "Bark is from Venus."
Bark: "Ark is from Mars."
Ark: "Bark is male."
Bark: "Ark is female."
On the basis of these declarations the employee can determine:
Ark: "Bark is from Venus."
Bark: "Ark is from Mars."
Ark: "Bark is male."
Bark: "Ark is female."
On the basis of these declarations the employee can determine: