Triclinic crystal has the following unit cell parameters : (a) \( a=b=c ; \alpha=\beta=\gamma=90...

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Triclinic crystal has the following unit cell parameters :
(a) \( a=b=c ; \alpha=\beta=\gamma=90^{\circ} \)
(b) \( a=b \neq c ; \alpha=\beta=\gamma=90^{\circ} \)
(c) \( a \neq b \neq c ; \alpha \neq \beta \neq \gamma \neq 90^{\circ} \)
(d) \( a=b \neq c ; \alpha=\beta=90^{\circ}, \gamma=120^{\circ} \)
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