Questions
~3 questions per paper
Difficulty
Medium
Importance
High scoring reliability for SSC and Banking Prelims
Overview
Scheduling Puzzles involve organizing events, people, or items based on specific temporal constraints like days, months, or age-based sequences. Mastering these is crucial for competitive exams as they test your ability to synthesize scattered information into a linear, logical timeline under strict time limits.
Day-Based Scheduling
These puzzles involve placing subjects into a sequence of days, typically from Monday to Sunday. Focus on establishing a fixed 'anchor' variable and then placing relative constraints like 'two days before' or 'immediately after' to fill the gaps.
- Identify the anchor day to fix the reference point.
- Differentiate between 'before/after' (non-contiguous) and 'immediately before/after' (adjacent).
- Use a 7-row table to map subjects to specific days.
- Prioritize constraints involving fixed days or definite positions.
Month and Year-Based Scheduling
In these problems, subjects are assigned to months (e.g., January to December) or years. The complexity increases when different variables like 'different cities' or 'favorite colors' are added to each month/year slot.
- Note the number of days in each month (30 vs 31) as it often serves as a hidden constraint.
- Use a vertical grid to organize multiple variables for each month.
- Check for parity constraints like 'even-numbered month' or 'quarterly periods'.
- Write down negative constraints explicitly to avoid missing information.
Age-Based Puzzles
These puzzles require calculating relative ages of multiple individuals based on current and future year references. The core skill is maintaining a consistent base year to perform all additions or subtractions accurately.
- Assign a variable 'x' to the youngest person to create algebraic relations for others.
- Always define the base year for the calculation clearly.
- Distinguish between 'years older than' and 'twice the age of'.
- Keep the age difference between two people constant regardless of the year.
Exam Tip
Always sketch a skeleton table first; the time spent drawing the structure is returned three-fold by eliminating re-reading and confusion during the deduction process.
Common Mistakes
- Confusing 'two days before' (meaning a gap of one day) with 'the second day before' (meaning two days prior).
- Failing to account for the leap year constraint when dates cross February.
- Attempting to solve the puzzle in mind without sketching a grid, leading to logical circularity errors.
More Revision Notes
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