1.

A unit vector normal to the plane through the points vec(i), 2vec(j)and 3vec(k) is

Answer»

`(6 vec(i)-3vec(J) 2vec(K))/(7)`
`(6vec(i)+3vec(j)+2vec(k))/(7)`
`(6vec(i)-3vec(j)-2vec(k))/(7)`
`(-6vec(i)-3vec(j)+2vec(k))/(7)`

Answer :B


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