Aneutral-density filter is in which filming conditions? inside in dim light inside in bright light outside in dim light outside in bright light

the answer of "what has three legs but never walks" is a yard stick. this answer can be found at

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.