Reasoning Formula Sheet
Formulas and rules for logical reasoning questions
Select Formula Category
Formula Collection
Clock & Calendar
Clock Angle
Time to coincide
Day of week
Permutations & Combinations
Permutation
Combination
Circular Permutation
Quick Shortcuts & Tips
Calendar: 0=Sunday, 1=Monday, ..., 6=Saturday
Clock: Every 65⁵/₁₁ minutes, hands coincide
Directions: Use coordinate system for complex puzzles
How to Use This Formula Sheet
Learn, Don't Memorize
Understand the derivation and application of each formula. Knowing why a formula works is more important than memorizing it.
Practice Application
Immediately after learning a formula, solve 5-10 problems using it. This reinforces learning and builds problem-solving skills.
Create Your Own Sheet
Copy formulas you frequently forget onto a physical sheet. The act of writing helps memory retention.
Regular Revision
Review formulas weekly. Use spaced repetition: next day, after 3 days, after 1 week, then monthly.
Common Formula Mistakes to Avoid
Unit Confusion
Always check units before applying formulas. Convert all measurements to consistent units (all in meters or all in centimeters).
Formula Misapplication
Ensure you're using the right formula for the given problem type. Don't force a formula that doesn't fit the situation.
Sign Errors
Pay attention to positive/negative signs, especially in physics and coordinate geometry formulas.
Approximation Errors
When using π = 22/7 or √2 = 1.414, be consistent. Don't mix exact and approximate values in the same calculation.