The number of basic crystal systems is

The number of basic crystal systems are:

The number of crystal systems known are:

Basic crystal systems known are:

What are crystal systems ?

Number of crystal systems having only 2 types of bravais lattices = x, number of crystal system having at least two interfacial angles equal = y and number of crystal systems having all the three edge lengths equal = z. Then find the value of x xx y xx z.

Number of crystal systems having only 2 types of bravais lattices = x, number of crystal system having at least two interfacial angles equal = y and number of crystal systems having all the three edge lengths equal = z. Then find the value of x xx y xx z.

The number of atoms in a unit cell of a cubic crystal system is 2, the arrangement of atoms is