Formula of the compound would be X2Y3.
Explanation: A ccp lattice is formed by the element Y of the compound. Hence, number of octahedral voids = number of atoms of element Y. In that element X occupies 2/3rd of the voids. So, formula of the compound is given by X:Y = 2/3:1 = 2:3.
∴ formula of the compound is X2Y3.
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