1.

Let vec(a)=2hat(i)+hat(j)+hat(k),vec(b)=hat(i)+2hat(j)-hat(k) and a unit vector vec(c) be coplanar. If vec(c)" is perpendicular to "vec(a)," then "vec(c)=

Answer»

`(-hat(J)+hat(k))/(SQRT(2))`
`(-hat(i)-hat(j)-hat(k))/(sqrt(3))`
`(hat(i)-2hat(j))/(sqrt(5))`
`(hat(i)-hat(j)-hat(k))/(sqrt(3))`

ANSWER :A


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