2017 PUMaC Team 11
Source:
September 20, 2019
combinatorics
Problem Statement
For a sequence of coin flips, each pair of consecutive flips and count the number of “Heads-Heads”, “Heads-Tails”, “Tails-Heads”, and “Tails-Tails” sequences is recorded. These four numbers are then multiplied to get the Tiger number of the sequence of flips. How many such sequences have a Tiger number of ?