How to solve odd-one-out puzzles
Odd one out: scan properties, not vibes
Four figures share a property; one violates it. Find it by scanning one attribute at a time — never by which figure 'feels' different.
Updated
Odd-one-out rewards systematic scanning. The defining property lives on exactly one attribute — shape, shading, size, or count — while other attributes are deliberately varied to distract you. The figure that 'looks different at a glance' is often a decoy.
The 4-vs-1 test
A property only counts if four figures share it and exactly one lacks it. A property held by three figures splits the set 3–2 and can't be the rule. Count occurrences: 'solid appears twice, outlined three times' kills shading as the rule; 'circle appears four times, square once' confirms shape.
The strategy
- Scan shapes: does one shape appear exactly once while another appears four times?
- If not, scan shading the same way. Then size. Then dot count.
- Verify: the four keepers all share the value; only your candidate differs.
- If two different figures could each be isolated, you've picked a non-rule — rescan; a well-built item isolates exactly one.
Common traps
- Attributes varied as noise: two sizes spread across the set so no single figure is 'the big one'.
- Semantic-style guessing ('this one looks busiest') — appearance judgments have no 4-vs-1 discipline.
- Stopping at the first difference you notice instead of confirming the count.
Speed · ~30s/item: Ordered scanning finds the rule in one or two passes — 15 to 40 seconds for most items.
Worked example
Made by the same generator and answer checker as the practice questions, at middling difficulty, but never served in a test. Commit to an option before you reveal — the pick is yours alone and is never recorded.
Which figure does not belong with the others?
Reveal the answer
The answer is E.
Show why — the worked reasoning
Try it yourself: 4 practice questions
Pick an answer, then reveal it. Nothing is recorded, there is no clock, and none of these questions is ever used in a test.
Which figure does not belong with the others?
Reveal the answer
The answer is C.
Show why — the worked reasoning
Which figure does not belong with the others?
Reveal the answer
The answer is B.
Show why — the worked reasoning
Which figure does not belong with the others?
Reveal the answer
The answer is E.
Show why — the worked reasoning
Which figure does not belong with the others?
Reveal the answer
The answer is D.
Show why — the worked reasoning
Try questions like this
The free test has 20 questions across abstract, numerical, verbal and spatial reasoning. It takes 12 minutes, needs no sign-up, and explains every answer.
A free account opens every lesson, practice drills and a study plan built from your results.
Questions people ask
How do you find the odd one out?
Look for a property that four figures share and exactly one lacks. Scan one property at a time: shape, then shading, then size, then count.
What if two figures could be the odd one out?
Then you have found a property that splits the set unevenly rather than four against one. Keep scanning until only one figure breaks a rule the other four all follow.
How long should an odd-one-out question take?
Ordered scanning usually finds the rule in one or two passes, about 15 to 40 seconds for most questions.
Will odd one out questions be on the free test?
Usually. The free test gives abstract reasoning 6 of its 20 questions and spreads them across the 6 abstract reasoning question types, so each type normally appears once.