Question 155

The last day of a century cannot be either.
I. Tuesday
II. Thursday
III. Saturday
IV. Sunday

Solution

100 years contain 5 odd days.
=> Last day of 1st century is Friday.
200 years contain (5 x 2) ≡ 3 odd days.
=> Last day of 2nd century is Wednesday.
300 years contain (5 x 3) = 15 ≡ 1 odd day.
=> Last day of 3rd century is Monday.
400 years contain 0 odd day.
=> Last day of 4th century is Sunday.
This cycle is repeated.
=> Last day of a century cannot be Tuesday or Thursday or Saturday.

So, the answer would be option c)I. II and III


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