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The last day of a century cannot be

Correct Answer: Tuesday

Explanation:

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.


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