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If vec(a)= (1)/(7) (2vec(i) + 3vec(j) -6...

If `vec(a)= (1)/(7) (2vec(i) + 3vec(j) -6vec(k)), vec(b)= (1)/(7) (3vec(i) - 6vec(j) + 2vec(k)) and vec(c )= (1)/(7) (6vec(i) + 2vec(j)- 3vec(k))` are such that `vec(a) xx vec(b)= lamda vec(c )` then find `lamda`.

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