In this guitar lesson Nicholas Roberts teaches you how to play the major and seventh arpeggio scale. 
A major scale is made up of seven distinct notes, plus an eighth which duplicates the first an octave higher while a major arpeggio scale is made up of three distinct notes derived from the major scale: the one, the five and the eight.  To play a seventh arpeggio scale simply include the seventh from the major scale in the arpeggio.