Consider two rectangular sheets, Sheet M and Sheet N of dimensions 6 cm × 4 cm each.
Folding operation 1: The sheet is folded into half by joining the short edges of the current shape.
Folding operation 2: The sheet is folded into half by joining the long edges of the current shape.
Folding operation 1 is carried out on Sheet M three times.
Folding operation 2 is carried out on Sheet N three times.
The ratio of perimeters of the final folded shape of Sheet N to the final folded shape of Sheet M is _______.
1
5 : 13
2
7 : 5
3
13 : 7
4
3 : 2