Lillian built a staircase out of blocks. She used 2 blocks to make the first step, 4 blocks to make the second step and 6 blocks to make the third step. If she continues using the same pattern, how many total blocks will she have used after making the fourth step? A. 8 B. 20 C. 36 D. 48

A. 8

Explanation:

2, 4, 6, 8

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.