Question

what the formula for finding a major scale

Answer 1

According to the Harvard Dictionary of Music*, a half step (or semitone) is "one-half of a whole tone, the smallest interval in traditional Western music. ... The octave consists of twelve semitones and the diatonic scaleincludes two semitones." (The major scale and the natural minor are diatonic scales.

Answer 2

According to the Harvard Dictionary of Music*, a half step (or semitone) is "one-half of a whole tone, the smallest interval in traditional Western music. ... The octave consists of twelve semitones and the diatonic scale includes two semitones." (The major scale and the natural minor are diatonic scales.)