What does variation mean in Dance?

In ballet, a variation (sometimes referred to as a pas seul, meaning to dance alone) is a solo dance. In a classical grand pas de deux, the ballerina and danseur each perform a variation.

Explanation:

including the octave, the answer would 8 notes in a major scale with one note being played twice. ex) c major scale includes: c, d, e, f, g, a, b, c

notice that c is played twice

however, if you were to ask me how many different notes are in a major scale- the answer would be 7.