AP EAMCET Engineering 17 Sep 2020 Shift 2 Paper

As given vector u,v and w given may be not parallel but they may be antiparallel
So,z≠au+bv+cw
So first is incorrect.
Also, if u=v+w
v=u+w
w=u+v
Then, u+v+w=2(u+v+w)
⇒‌‌u+v+w=0≠z
So, option (b) is incorrect.
Similarly, option (c) is incorrect.