Let a,b, c be the three vectors such that `a.(b + c) = b . (c + a) = c . (a + b) =0` and` |a| = 1,|b| = 4,|c|= 8`, then `|a + b + c| =`

If a,b,c are vectors such that a*b=0 and a+b=c

If a,b,c are unit vectors such that a + b + c = 0 then a.b + b.c + c + c . A=

If vec a, vec b, vec c are three vectors such that vec a . (vec b + vec c) + vec b . (vec c + vec a) + vec c . (vec a + vec b) = 0 and |vec a| = 1, |vec b | = 4, |vec c| = 8 , then |vec a + vec b + vec c| =

Let a,b,c be three vectors such that a ne 0 and a xx b = 2a xx c,|a| = |c| = 1, |b| = 4 and |b xx c| = sqrt(15) . If b - 2 c = lambda a, then lambda is equal ot

If a,b,c are three vectors such that a + b + c = 0, |a| = 1, |b| = 2, |c| = 3 then a.b+ b.c + c.a =