What are the burger vector representations for fcc

Question

Response to the following problem:

For both FCC and BCC crystal structures, the Burger's vector b may be expressed as

b=1/2a[hkl]

where a is the unit cell length and [hkl] is the crystallographic direction having the greatest linear atomic density.

(a) What are the Burger's vector representations for FCC, BCC, and SC structures?

(b) If the magnitude of the Burger's vector |b| is

|b|=1/2a(h²+k²+l²)1/2

Determine the values of |b| for aluminum and tungsten.