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

Let vec a,vec b,vec c be three vectors such that vec a!=0, and vec a xxvec b=2vec a xxvec c,|vec a|=|vec c|=1,|vec b|=4|vec a xxvec c|=sqrt(15) If vec b-2vec c=lambdavec a, then lambda equal to

If three vectors a,b,c are such that a !=0 and a xx b = 2 (a xx c), |a| = |c| = 1, |b| = 4 and the angle between b and c is cos^(-1) (1/4), then b - 2c = lambda a where lambda =

If [a xx b b xx c c xx a] lambda [a b c]^(2) then lambda is equal to