Let `a=2i+4j-5k`,`b=i+j+k` and `c=j+2k` .Find the unit vector in the opposite direction of `a+b+c`

Find the resultant of vectors vec a=hat i-hat j+2hat k and vec b=hat i+2hat j-4hat k. Find the unit vector in the direction of the resultant vector.

For given vectors,vec a=2hat i-hat j+2hat k and vec b=-hat i+hat j-hat k find the unit vector in the direction of the vector quad vec a+vec b

If vec a=hat i+hat j,vec b=hat j+hat k,vec c=hat k+hat i find the unit vector in the direction of vec a+vec b+vec c

Let vec a=4i+5j-k,vec b=i-4j+5k and vec c=3i+j-k. Find the vector which perpendicular to both a and b whose magnitude is twenty one xx the magnitude of C

Given a=i+j-k, b=-i+2j+k" and "c=-i+2j-k . A unit vector perpendicular to both a + b and b + c is