3
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My sister sent me this pattern sequence. Please excuse the bad image quality.

enter image description here

Source

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6
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I think it must be

enter image description here

because

Rule for plus signs: Every plus sign must be connected with another plus sign in the neighboring cell.
Rule for triangles: Last cell of each row contains the triangles that are present in all three prior cells.

The only option this works with is the mentioned one

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  • $\begingroup$ It could also be the top left because none to the triangles in each tile share the same arrangement with any of the adjacent tiles. $\endgroup$ Jan 10 at 14:32
  • $\begingroup$ It must be correct. It is the only choice that has a placement of plusses shared with 2 other choices and the placement of triangles shared with 2 other choices. The intent was to make it less easy to solve with only half the solution. $\endgroup$
    – Florian F
    Jan 11 at 21:37
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The connection is between the crosses which are closest to the sides and to vertices.

On the first row 5 crosses are close to the sides and 1 cross to the vertex.

On the second row 5 crosses are close to the vertices and 1 close to the side.

On the third row 3 crosses are close to the sides and 3 crosses close to the vertices.

On the fourth row 1 cross is close to the side and 2 crosses close to the vertices.

If we add to the empty space the card on the bottom right, then we have 2 crosses close to the sides of the triangle. So my answer is the bottom, right card.

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