Question: how many shrutis are there?
Answer: 22 Shrutis are a sub-set of Natural 7 Shrutis The Indian Classical Music (both Hindustani and Carnatic) is based on the Tanpura, which produces the 1st 3 natural shrutis, Shadja (1st Harmonic), Gandhar (5th Harmonic), and Pancham (3rd Harmonic), at a ratio of 100:125:150.