Aptitude · Logical reasoning
Odd one out and analogies, made easy
💡 The idea
Find what three of them share (odd one out), or the one rule from the first pair (analogy), and test it carefully.
Look for a family→Test each item→The one that breaks it
🧭 The method: 3 steps
- Try common families: even/odd, primes, squares, cubes, multiples.
- For letters, turn them into numbers and look at the gaps.
- For analogies, find the rule from the first pair and apply it to the second.
🎬 Every kind of question, in pictures
Pick a kind. Guess the answer first, then watch the picture work it out. Tap any step to see it in the picture.
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✏️ Worked examples
Example 1. Odd one out: 9, 25, 49, 63
- 9 = 3², 25 = 5², 49 = 7²
- 63 is not a square
⚡ Shortcut: 63
⚠️ Where people go wrong
- Stopping at the first pattern you see: check all four.
- 2 → 8 could be ×4 or a cube: check which rule the question really means.
- Ignoring the order of the letters in a pair.
📌 Remember
- Squares to 15², cubes to 10³
- Primes to 50
- Letters → numbers