Question

The last day of a century 1900 was?

• A. Monday
• B. Wednesday
• C. Tuesday
• D. Friday

Answer 1

Answer:

A. Monday

Solution: 100 years contain 5 odd days. Last day of 1st century is Friday. 200 years contain (5 × 2) = 3 odd days. Last day of 2nd century is Wednesday. 300 years contain (5 × 3) = 15 = 1 odd day. Last day of 3rd century is Monday. 400 years contain 0 odd days. Last day of 4th century is Sunday. This cycle is repeated. Century 1900 = 1600 + 300 = 1 odd day Thus, 31st December 1900 was Monday. Hence, the correct answer is option 1) Monday.