Of the following expressions, select all that are defined. Assume all vectors have 3 components so that the cross products and dot products are defined. Vectors are written in bold
1. a(b•c)
2. (a•b)c
3. (a•b)c
4. (a•b)c
5. a•b+10
6. a•b+10
7. None of the above are defined.
