The frequencies 391 99Hz, 783 98Hz and 1175 97Hz are of a musical note, WHY - Science - Sound

Question

The frequencies 391 99Hz, 783 98Hz and 1175 97Hz are of a
musical note, WHY?

Shikha Bhadoria · Accepted Answer

Certain frequencies within the audible range of 20 to 20 kHz are
pleasant when sensed by the human ear These are harmoniously used
to form a musical note

The frequencies 391.99Hz, 783.98Hz and 1175.97Hz are of a musical note, WHY?