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Coded Blood Relations

Coded Blood Relations problems represent family relationships using symbols or codes (e.g., 'A+B' means A is brother of B, 'A-B' means A is sister of B). You must decode the symbolic expressions and determine the relationship between given persons.

10Worksheets
200+Practice Questions
IntermediateDifficulty
2-3 hoursHours to Master

What You'll Learn

Introduction & Overview Why This Matters How to Solve Pro Tips & Tricks
Shortcut Methods Common Mistakes Practice Worksheets Exam Importance

Introduction to Coded Blood Relations

Coded Blood Relations problems represent family relationships using symbols or codes (e.g., 'A+B' means A is brother of B, 'A-B' means A is sister of B). You must decode the symbolic expressions and determine the relationship between given persons.

Prerequisites

Basic blood relation terms Symbol decoding skills Expression evaluation Step-by-step decoding
Why This Matters: Coded Blood Relations problems appear in 1-2 questions in SSC CGL and Banking PO exams. They test pattern recognition and code decoding skills.

How to Solve Coded Blood Relations Problems

1

Step 1: Read the coding scheme carefully (e.g., A+B = A is father of B)

2

Step 2: Write down all symbol definitions for quick reference

3

Step 3: Break down the coded expression into smaller parts

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Step 4: Decode each part using the given symbol definitions

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Step 5: Combine the decoded parts to form the complete relationship

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Step 6: Use parentheses to handle complex expressions with multiple operations

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Step 7: Apply the decoded relationship to answer the question

Pro Strategy: Decode from left to right, but handle innermost expressions first. Keep track of the gender implications of each symbol (e.g., 'brother' implies male).

Example Problem

Example: If 'A+B' means 'A is the mother of B', and 'A-B' means 'A is the brother of B', decode 'C+D-E' to find how E is related to C. Solution: Step 1: + = mother, - = brother Step 2: Break: C+D means C is mother of D Step 3: D-E means D is brother of E Step 4: So, C is mother of D, D is brother of E → C is mother of E as well (since D and E are siblings) Step 5: E could be son or daughter of C Answer: E is child of C (son or daughter)

Pro Tips & Tricks

  • Write the symbol definitions at the top of your workspace
  • For complex expressions, add parentheses to show grouping
  • Track the gender of each person as you decode
  • Common symbols: + (brother/father), - (sister/mother), × (spouse), ÷ (child)
  • If a symbol implies gender, note it immediately
  • Decode step by step—don't try to decode the whole expression at once

Shortcut Methods to Solve Faster

Decode innermost expressions first
Build a small family tree as you decode
If A+B means A is parent of B, then B is child of A
If A×B means A is spouse of B, the relationship is symmetric

Common Mistakes to Avoid

Misreading the symbol definitions
Forgetting that brother/sister implies specific gender
Decoding in the wrong order
Assuming symmetry where it doesn't exist (e.g., 'father of' is not symmetric)

Exam Importance

Coded Blood Relations is an important topic for various competitive exams. Here's how frequently it appears:

SSC CGL
1-2 questions
BANKING PO
1-2 questions
RAILWAYS RRB
1-2 questions
INSURANCE
1-2 questions

Ready to Master Coded Blood Relations?

Start with Worksheet 1 and work your way up to expert level! Each worksheet includes:

20 practice questions
Detailed solutions
Step-by-step explanations
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