1.

In a monoclinic unit cell :

Answer»

a = b = C, `ALPHA = BETA = gamma NE 90^(@)`
a = b = c, `alpha = beta = gamma = 120^(@)`
a = b = c, `alpha = beta = gamma = 90^(@)`
a ne b ne c, `alpha = gamma = 90^(@) beta ne 90^(@) `

Answer :D


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