What is the number of octahedral and tetrahedral voids present respectively in $0.25 \ mol$ of a substance having $hcp$ structure?
- A$3.011 \times 10^{23}, 1.50 \times 10^{23}$
- B$6.011 \times 10^{23}, 3.011 \times 10^{23}$
- C$3.011 \times 10^{23}, 6.022 \times 10^{23}$
- D$1.50 \times 10^{23}, 3.011 \times 10^{23}$
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