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Fact 1: Mary said, "Ann and I both have
cats.Fact 2: Ann said, "I don't have a cat.Fact 3: Mary always tells the truth, but Ann
sometimes lies.If the first three statements are facts, which of
the following statements must also be a fact?I. Ann has a cat.II. Mary has a cat.III. Ann is lying.
Options:
A .  II only
B .  I and II only
C .  I, II, and III
D .  None of the statements is a known fact.
Answer: Option C


If Mary always tells the truth, then both Ann
and Mary have cats (statements I and II), and
Ann is lying (statement III).



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