In how many ways can Kwan line up her carvings of a duck, a gull, and a pelican on a shelf?

3 answers

duck= d
gull= g
pelican= p

dgp, dpg, gdp, gpd, pdg, pgd
dgp,dpg,gdp,gpd,pdg,pgd
Dgp/Dpg/Gdp/Gpd/Pgd