The fig. (X) is similar to the
Form VI. So, when a cube is formed by folding the sheet shown in fig. (X), then
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is one of the faces of the cube. However, the cube in fig. (1) has two such faces and fig. (4) has a face which is completely shaded. So, these two cubes cannot be formed. Hence, only the cubes in figures (2) and (3) can be formed.