1.

If vec(a)= 3 vec(i)- vec(j)-2vec(k), vec(b)= 2vec(i) + 3vec(j) + vec(k), then (vec(a) + 2vec(b)) xx (2vec(a) - vec(b))=

Answer»

`-25 vec(i) + 35 vec(J) -55vec(k)`
`25 vec(i)-35 vec(j) + 55vec(k)`
`25 vec(i) + 35vec(j)- 55vec(k)`
`-25vec(i) -35vec(j)-55vec(k)`

ANSWER :A


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