The number of crystal systems known are:

The number of basic crystal systems are:

Basic crystal systems known are:

The number of basic crystal systems is

The type of crystal system shown is

The type of crystal system shown is

There are 14 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.