Question

If →a,→b,→c are three vectors such that ∣→a+→b+→c∣=0 and ∣→a∣=.2,∣→b∣=3,∣→c∣=5,then value of →a.→b+→b.→c+→c.→a is

Answer 1

Here is your answer.......

the directions of every vector is not same because the addition of vectors is zero

then,

→a.→b+→b.⬅c+⬅c.→a=→ab⬅c|=0

Hope ot is useful for you!