1.

Let bara=2bari+barj+bark,barb=bari+2barj-bark and a unit vector barc be coplaner. If barc is perpendiclar to bara then barc=

Answer»

`1/(SQRT2)(-barj+bark)`
`1/(SQRT3)(-bari-barj-bark)`
`1/(SQRT5)(bari-2barj)`
`1/(sqrt3)(bari-barj-bark)`

ANSWER :D


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