Addition & Removal Pattern — Medium Matrix Reasoning Question

What to learn from this pattern

Every cell holds exactly 3 objects: 2 circles and 1 triangle, all red and medium-sized.

Explanation

Every cell holds exactly 3 objects: 2 circles and 1 triangle, all red and medium-sized. • Each row keeps the same count of 3 objects — this never changes. • The shapes stay fixed: always 2 circles + 1 triangle per cell. • Only the positions of those shapes shift from cell to cell. • Cell 9 must have 2 circles + 1 triangle — no more, no less. • A (4 objects) and D (5 objects) have too many. C (2 objects) and E (1 object) have too few. F is empty. Only B has the right 3 objects.

Why the other options are wrong

• Aoff-by-one-high — Added an extra object — one more than the conserved count. (Colour and shape are right; the count is not.)
• Coff-by-one-low — Dropped one object — one fewer than the conserved count.
• Doff-by-two-high — Added two extra objects — two more than the conserved count.
• Eoff-by-two-low — Dropped two objects — two fewer than the conserved count.
• Fmissing-count — Picked an empty cell — ignored the conserved count entirely.