Illogical Option MCQ
Illogical Option MCQ problems present multiple-choice questions where some options can be eliminated immediately because they are biologically or mathematically impossible (e.g., negative age, parent too young, child older than parent).
What You'll Learn
Introduction to Illogical Option MCQ
Illogical Option MCQ problems present multiple-choice questions where some options can be eliminated immediately because they are biologically or mathematically impossible (e.g., negative age, parent too young, child older than parent).
Prerequisites
How to Solve Illogical Option MCQ Problems
Step 1: Read the problem and identify age relationships
Step 2: Apply basic biological constraints (parent must be 15+ years older than child)
Step 3: Check for negative or zero ages
Step 4: Verify that older person's age > younger person's age
Step 5: Check if ages are reasonable (e.g., not over 150 years)
Step 6: Eliminate options that violate any constraint
Step 7: Among remaining options, solve or select the logical one
Example Problem
Example: A father is 3 times as old as his son. Which of the following could be their ages? Options: A) Father 30, Son 15 B) Father 25, Son 20 C) Father 40, Son 5 D) Father 35, Son 10 Solution: Step 1: Father must be older than son (all satisfy) Step 2: Father must be at least 15-20 years older than son Option A: 30-15=15 years (possible) Option B: 25-20=5 years (father too young - unlikely but possible in teen pregnancy? Usually not considered) Option C: 40-5=35 years (possible but large gap) Option D: 35-10=25 years (possible) Step 3: Also check the multiple: 30/15=2 (not 3), 25/20=1.25, 40/5=8, 35/10=3.5 - None exactly 3! Wait, need exactly 3 times. So all options are wrong? Or re-read: The question asks 'could be' meaning approximate? Usually exact. So none satisfy 3×. Actually, let's check: 3×15=45 (not 30), 3×20=60 (not 25), 3×5=15 (not 40), 3×10=30 (not 35). None. The point: illogical options are those that don't satisfy the given relationship.
Pro Tips & Tricks
- Parent must be at least 15 years older than child
- Age cannot be negative or zero for living persons
- Maximum human age is around 120-150 years
- Grandparents are typically 40-70 years older than grandchildren
- If ages are in ratio, both must be multiples of something
- Past ages must be positive (no negative ages)
Shortcut Methods to Solve Faster
Common Mistakes to Avoid
Practice Worksheets
Practice makes perfect! Work through these worksheets to master Illogical Option MCQ. Each worksheet contains 20 questions with detailed explanations. Start from Worksheet 1 and progress through increasing difficulty levels.
Exam Importance
Illogical Option MCQ is an important topic for various competitive exams. Here's how frequently it appears:
Ready to Master Illogical Option MCQ?
Start with Worksheet 1 and work your way up to expert level! Each worksheet includes: