Paper 1 · Mathematical Reasoning and Aptitude
The last day of a century cannot be
AMonday
BWednesday
CTuesday ✓ Correct
DFriday
Correct answer: (C) Tuesday — The last day of a century cannot be Tuesday, so that is the answer.
Explanation
★The last day of a century cannot be Tuesday, so that is the answer.
★The last day of a century depends on the odd days left by 100, 200, 300 or 400 years.
★These leave 5, 3, 1 or 0 odd days, which correspond to Friday, Wednesday, Monday and Sunday.
★So the last day of a century can only be a Friday, Wednesday, Monday or Sunday.
★It can never fall on Tuesday, Thursday or Saturday.
★So the last day of a century cannot be Tuesday.
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