BdMO Problem 5

Poly, Mili and Lily are three sisters. Lily tells the truth on 6 days of a week. Poly tells the truth on one day of the week and Mili tells the truth on 2 days of the week. If Poly tells the truth on a day, then Mili also tells the truth on that day.

On Friday, Lily told Mili, “Today Poly will tell the truth.” But Mili said, “No. Tomorrow Poly will tell the truth.” Then Poly said, “Lily is right.”. On which day of the week does Poly tell the truth?

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