In hcp lattice, if a plane is drawn parallel to layers A and B, at a distance c/8 above the layer B, it passesthrough centres of x tetrahedral and y octahedral voids. A plane parallel to layer A, at a distance c/8 justbelow it passes through centres of p tetrahedral and q octahedral voids. Find (x + y + p+q). c is the cellparameter of hcp lattice, the vertical edge length. (A) 10(B) 9(C) 6(D) 14

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