On which day the flat was purchased by Amsa in 1996? I. Certainly before 18th December, 1996 but definitely not before 15th December, 1996. II. Certainly after 16th December, 1996 but not later than 19th December, 1996.
From statement I, we conclude that Amsa purchased the flat between 15th and 18th December.
From statement II we conclude that the flat was purchased between 16th and 19th December.
The day common to above two groups is 17th December.
So, Amsa purchased the flat on 17th December.
Thus both I and II are needed.
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