1.

vec(a)= 2vec(i) + vec(j) -vec(k), vec(b)= -vec(i) + 2vec(j)- 4vec(k) and vec(c )= vec(i) + vec(j) + vec(k), then find (vec(a) xx vec(b)).(vec(b) xx vec(c )).

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ANSWER :`-54`


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