Mastering Series in Logical Reasoning

Aug 12, 2024

Logical Reasoning Video on Series

Overview

  • Importance of series in placement tests, job interviews, and entrance exams.
  • Many candidates struggle with identifying patterns in series.
  • The purpose of the video is to teach approaches and tips for solving series questions quickly.

Types of Series

  1. Numeric Series (related to numbers)
  2. Alphabet Series (letters)
  3. Alphanumeric Series (combination of letters and numbers)
  4. Symbol Series (not covered in this session)

Formats of Series Questions

  1. Find the next number/group in the series.
  2. Find the missing numbers/letters in the series.
  3. Find the odd element in the series.

Tips for Solving Series

  • Finding Relationships:
    • Compare each element with previous and next elements to determine a pattern.
    • Look for constant differences.
    • If differences are large or increasing rapidly, consider relationships to squares, cubes, or multiplication.
    • For smaller or more consistent differences, the series may relate to addition, subtraction, or prime numbers.

Numeric Series Subcategories

1. Addition Series

  • Example: 19, 25, 32, 40, ?, 59
    • Differences: 6, 7, 8, 9, 10.
    • Next number = 49.

2. Subtraction Series

  • Example: 100, 85, 68, ?, 34
    • Constant difference of -17.
    • Next number = 51.

3. Multiplication Series

  • Example: 1, 2, 6, 24, ?, ?
    • Relations: 1x2, 2x3, 6x4, etc.
    • Next number = 120, then 720.

4. Division Series

  • Example: 216, ?, 72, 36, 12, ?
    • Relationship of division: 216/3, 72/2, 36/3.
    • Next number = 6.

Special Numeric Series

  1. Square Series:
    • Example could be based on squares of numbers, e.g., n²-1.
  2. Cube Series:
    • Example: 64 (4^3), 125 (5^3), etc.
  3. Prime Number Series:
    • Addition may include prime numbers.
  4. Fibonacci Series:
    • Each number is the sum of the two preceding ones.

Alphabet Series

  • Easier than numeric series.
  • Use A-Z position chart.
  • Vowels and Consonants:
    • Identify patterns based on vowels or consonants.

Alphanumeric Series

  • Combine letters and numbers using the same principles as above.
  • Assess whether numbers relate to positions or other elements.

Practice Questions

  1. Identify patterns using differences, addition, multiplication, and possible prime or Fibonacci connections.
  2. Break down complex numbers or series into manageable parts.
  3. Use trial and error with logic to deduce answers.

Conclusion

  • Emphasize the need for practice in mastering series.
  • Encourage visiting career websites for job offerings.
  • Invite viewers to share feedback and subscribe for more tutorials.