Practice: Single-Rule Sets

This lesson puts your knowledge into action with worked examples of single-rule sets — questions where one attribute alone distinguishes Set A from Set B. These are the foundation. Once you can consistently identify single rules in under 10 seconds, you are ready for the compound rules and distractors covered in the next course.

Each example below follows the same structure: the sets are described, you are invited to identify the rule yourself, and then a full explanation follows.

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Example 1: Shape Presence

Set A:

• Box 1: One circle, two squares, one triangle
• Box 2: Three circles, one pentagon
• Box 3: One circle, one hexagon, two rectangles
• Box 4: Two circles, one diamond
• Box 5: One circle, four triangles
• Box 6: One circle, one arrow, one star

Set B:

• Box 1: Two triangles, one square, one pentagon
• Box 2: Three hexagons, two rectangles
• Box 3: One arrow, one diamond, one star
• Box 4: Four squares
• Box 5: One pentagon, two triangles, one hexagon
• Box 6: Two rectangles, one arrow

Pause here. Can you identify the rule before reading on?

Solution