# Folding a Strip of Labeled Stamps

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This Demonstration illustrates the different ways a strip of stamps labeled 1 through can be folded into a stack one stamp wide. In each figure, the colored lines represent the stamps and the dotted lines represent the perforation between adjacent stamps.

Contributed by: Robert Dickau (March 2011)

Open content licensed under CC BY-NC-SA

## Snapshots

## Details

Snapshot 1: for 1, 2, and 3 stamps, the number of labeled stamp foldings is equal to the number of permutations of items, or

Snapshots 2, 3: for stamps, the number of labeled stamp foldings is less than , since some permutations lead to impossible foldings; for example, is an impossible folding, since the perforation joining stamps 1 and 2 would intersect with the perforation joining 3 and 4

M. Gardner, "The Combinatorics of Paper Folding," *Wheels, Life and Other Mathematical Amusements*, New York: W. H. Freeman, 1983 pp. 60–61.

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