A group of 14 men are standing up stairs with a pair of men on each stair with identical shirts on except for one .
Chances are about even that a groom and his friends pose for a wedding picture on some stairs .
Chances are about even that a groom and his friends pose for a wedding picture on some stairs .
It is impossible that a groom and his friends pose for a wedding picture on some stairs .
A groom and his friends pose for a wedding picture on some stairs .