(b) When the sheet in fig. (X) is folded to forma cube , then ‘F’ appears opposite ‘(c)’ and‘(a)’ appears opposite ‘D’. Therefore, the cube in fig. (a) which shows ‘F’ adjacent to‘(b)’, the cube in fig.(c) which shows ‘E’adjacent to ‘(c)’ and the cube in fig. (D)which shows ‘(a)’ adjacent to ‘D’ cannot be formed.