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Chemistry
Physical: Solid State
Which of the following is correct for hexagonal crystal system?
a = b ≠ c, α = β = γ = 90o
a ≠ b ≠ c, α = β = γ = 90o
a = b ≠ c, α = β = 90o , γ = 120o
a ≠ b ≠ c, α = γ = 90o , β ≠ 90o