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Question: Four subjects - Physics, Chemistry, Mathematics and Biology - were taught in four consecutive periods of one hour each starting from 8.00 a.m. At what time was the Chemistry period scheduled? Statements: Mathematics period ended at 10.00 a.m., which was preceded by Biology. Physics was scheduled in the last period. Mathematics period was immediately followed by Chemistry.

Only I
Either I only or II only
Only II
Only II and III
Only I and either II or III

Correct Answer: Only I and either II or III

Explanation:

From I and II, we conclude that Mathematics period began at 9.00 a.m., Biology period began at 8.00 a.m. and Physics period began at 11 a.m. So, the Chemistry period began at 10.00 a.m.

From I and III, we conclude that Mathematics period ended and Chemistry period began at 10.00 a.m.

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