What elements of arts used in grand mosque?​

Natural materials have been used almost entirely throughout the mosque, including marble, stone, gold, semi-precious stones, crystals and ceramics

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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.