168. If û and are unit vectors and 0 is the acute angle
between them, then 2 û x3 is a unit vector for
[2007]
(a) no value of 0
(b) exactly one value
![168 If û and are unit vectors and 0 is the acute anglebetween them then 2 û x3 is a unit vector for2007a no value of 0b exactly one value class=](https://hi-static.z-dn.net/files/dbc/a5eb5250f75bdc28744cb85c0034318e.png)