Intelligence Test
Classification - Numbers
MCQ

Introduction

Classification involves identifying a group of elements that share a common characteristic and spotting the 'Odd One Out' that does not belong to that group. In mathematics, this is based on number properties.

Explanation Step by Step

To solve classification problems: 1. Observe the given numbers. 2. Find a common logic (multiples, squares, etc.) for three numbers. 3. The number that doesn't fit the logic is the answer.

Sub-topics

Numbers

Focuses on patterns like prime numbers, divisibility rules, and digital sums/products.

Examples

Example 1
Options: 1) 85 2) 68 3) 119 4) 95. Numbers 85, 68, and 119 are divisible by 17.
Answer: Option 4 (95 is not divisible by 17)
Example 2
Numbers formed using digits 5, 4, 3, 7. 1) 5437 2) 7354 3) 3745. Option 4 is 3725.
Answer: Option 4 (Digit 2 is used instead of 4)

Tricks and Shortcuts

Always check for divisibility by prime numbers like 7, 13, 17, and 19 first. If numbers are large, check the sum of digits immediately.

Common Mistakes

Ignoring the possibility of a multiplication pattern within the digits and only looking for simple addition or subtraction.

Practice Questions

Easy Questions

  1. 1) 4 2) 9 3) 16 4) 20
  2. 1) 10 2) 20 3) 35 4) 40
  3. 1) 33 2) 55 3) 77 4) 89

Medium Questions

  1. 1) 51 2) 85 3) 102 4) 115
  2. 1) 123 2) 234 3) 345 4) 457
  3. 1) 135 2) 246 3) 357 4) 469

Hard Questions

  1. 1) 5423 2) 6252 3) 8531 4) 5812
  2. 1) 9811 2) 7611 3) 5411 4) 3212
  3. 1) 2408 2) 3206 3) 4812 4) 1204

Revision Summary

Mastering classification requires a strong command over tables and number series logic.

Which of the following numbers is different from the others? (20, 25, 30, 35, 37)
A
20
B
25
C
30
D
37
Explanation
20,25,30,35 are multiples of 5; 37 No
Correct 46 Wrong 14