In permanent waving the size of the rod determines?

the size of the curl

Explanation:

Alkaline waves are also known as cold waves. In permanent waving, the size of the rod determines the size of the curl.The most common type of perm rod; they have a smaller diameter in the center that increases to a larger diameter on the ends. These rods are equal in diameter along the entire length or curling area.

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.