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Which one of the patterns labelled P, Q, R, and S is used to generate the following figure?

A wide black and white tiled figure above four square candidate patterns labelled P, Q, R and S

  • A.P
  • B.Q
  • C.R
  • D.S

Answer: B

The figure is generated by pattern Q.

The wide figure is three copies of one square tile placed side by side. Comparing that tile with the four candidates cell by cell, Q matches it everywhere.

Each of the others differs from the tile in one region: P has a different arrangement in its centre, R in its top right corner, and S in its bottom left corner, where it shows a block shape that never appears in the figure. Checking the corners and the centre first is the quick way to separate near-identical patterns like these.

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