Right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are :
8, 4
6, 12
2, 1
12, 6
Number of octahedral and tetrahedral voids formed by N closed packed atoms are N and 2N respectively. Each hexagonal unit cell contains 6 atoms therefore, number of tetrahedral and octahedral voids are 12 and 6 respectively.
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