Logical Reasoning
hardQ. No. 19654
Which is the first year after 1981 that has exactly the same calendar as 1981?
Last Updated:
A1982
B1987
C1983
D1984
Correct Answer: 1987Your Answer: B
Explanation
Correct answer: Option B — 1987. A reusable calendar requires the same weekday on 1 January and the same leap status. Checking successive years after 1981, the first year satisfying both conditions is 1987. Option A (1982) is rejected because it does not equal the computed result; it represents a counting, direction, leap-year, interval, or hand-motion error. Option C (1983) is rejected because it does not equal the computed result; it represents a counting, direction, leap-year, interval, or hand-motion error. Option D (1984) is rejected because it does not equal the computed result; it represents a counting, direction, leap-year, interval, or hand-motion error.
Important Notes
- Keep units consistent. Reduce day differences modulo 7; treat 12 on a clock as zero for angle work; and convert gained or lost minutes into the same time unit as the stated interval.
- Check boundary cases explicitly: February, century years, noon, midnight, and an angle greater than 180 degrees often change the apparent answer. A century is a leap year only when divisible by 400.
- Verify the result independently. For calendar problems, move forward or backward by the remainder after division by