Reasoning Ability - Calendar Problems
The calendar of 1977 will repeat again in which of the following years?
The calendar of 1977 will repeat again in which of the following years?
medium Q8 of 15
Step-by-Step Solution
Step 1: Identify 1977 type
1977 is a non-leap year.Step 2: Try 6-year candidate (1977 → 1983)
Leap years between 1978–1982: 1980 → 1 leap; ordinary = 5.Step 3: Compute odd days
Odd days = (5 × 1) + (1 × 2) = 5 + 2 = 7 → 7 ≡ 0 (mod 7) → calendars repeat.Final Answer:
1983 → Option BQuick Check:
Odd days sum 7 → repetition confirmed ✅
Quick Trick: Add 6 years for non-leap repeats and verify odd-day total.
Common Mistakes:
MISTAKES- Picking a nearby leap year instead of the actual repeat.
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