Reasoning Ability - Calendar Problems
If 1st January 1801 was Thursday, what day was 1st January 2001?
If 1st January 1801 was Thursday, what day was 1st January 2001?
medium Q6 of 15
Step-by-Step Solution
Step 1: Span
1801 → 2001 = 200 years.Step 2: Odd days
Each 100 years = 5 odd days → total = 10 → 10 mod 7 = 3.Step 3: Apply shift
Thursday + 3 = Sunday.Final Answer:
Sunday → Option AQuick Check:
200 years = +3 → Thursday → Sunday ✅
Quick Trick: 200-year = 3 odd days (2×5 ≡ 3 mod 7).
Common Mistakes:
MISTAKES- Missing modulo reduction (10 mod 7 = 3).
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