If three elements \( \mathrm{P}, \mathrm{Q} \) and \( \mathrm{R} \) crystallises in a cubic soli...

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If three elements \( \mathrm{P}, \mathrm{Q} \) and \( \mathrm{R} \) crystallises in a cubic solid lattice with \( \mathrm{P} \) atoms at the corners, \( \mathrm{Q} \) atoms at the cube centres and \( \mathrm{R} \) atoms at the centre of the face of the cube, then write the formula of the compound.
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