A compound has a cubical arrangement and...

A compound has a cubical arrangement and consist of atoms of P, Q and R, P atoms are pressure at the corners, Q atoms occupy face center position and R occupy alternate tetrahederal void as well as all octahedral void. If all the atoms lying on any one body diagonal are missing, then what would be the formula?

`PQ_(3)R_(8)`

`PQ_(4)R_(8)`

`P_(3)Q_(12)R_(32)`

`P_(3)Q_(12)R_(20)`

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