In each of the following questions, select a figure from amongst the four…

Concept: In a 2×2 figure-completion grid, the two cells of a column often combine into one composite figure that is symmetric about the line dividing them. Once one cell of a column is known, that symmetry fixes exactly what shape the other cell of the same column must hold.

1. In figure (X), the right column is fully drawn: the top-right cell holds a shaded triangle pointing down with its apex on the row-divider, and the bottom-right cell holds a shaded triangle pointing up with its apex on the same row-divider — together the two cells form one complete shaded hourglass split by that divider.

2. The top-left cell of figure (X) holds a shaded triangle pointing down, matching the top-right cell's triangle in size and shading — so the left column begins the same way the right column does.

3. For the left column to complete into the same kind of hourglass as the right column, its missing bottom-left cell must hold the mirror piece: a shaded triangle pointing up, apex on the row-divider and base on the grid's bottom edge, matching the top-left cell's triangle in size — the same way the bottom-right triangle matches the top-right one.

Placing that upward triangle in the blank makes both columns show an identical shaded hourglass, giving the fully uniform grid shown below, which confirms the fit. A downward triangle in the blank would only repeat the top-left cell instead of mirroring it, breaking the hourglass, and the half-shaded diagonal-square figure belongs to a different construction altogether, so neither of those alternatives completes the series.