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Non-verbal reasoning: odd one out

Odd one out questions show a set of figures, where all but one share a feature. Look for what is the same about most of them before you decide which is different.

What is tested

  • Shape, size, shading and direction
  • Counting features (sides, dots)
  • A hidden numerical rule (for example, totals)

Worked example

Four boxes each show circles and squares. Three boxes have 6 shapes in total; the fourth has 7. Which is the odd one out?

  1. Count all the shapes in each box.
  2. Three boxes total 6 (3+3, 2+4, 4+2).
  3. The box with 3 circles and 4 squares totals 7, so it is different.

Answer: the fourth box (7 shapes)

Exam-day checklist

  • Compare shape, size, shading and direction.
  • Count sides, dots and lines.
  • Try more than one property.
  • Check your rule works for the three that match.

Common mistakes

  • Choosing on the first difference you spot.
  • Missing that the rule is a number, not a look.
  • Ignoring orientation.

Try it yourself

1. Which of the four triangles is the odd one out?

Show answer

the unshaded triangle

Three share the shading; one does not.

2. Which of the four shapes is the odd one out?

Show answer

the pentagon

The square, rectangle and rhombus each have 4 sides; the pentagon has 5.

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