1.

The unit vector parallel to the vecotr bar(a)-bar(b) is ……………. where bar(a)=(1,2,-3) and bar(b)=(-2,-4,-9)

Answer»

`+-(1,2,2)`
`+-(3,6,6)`
`+-((1)/(3),(2)/(3),(2)/(3))`
`+-((2)/(3),(2)/(3),(1)/(3))`

ANSWER :C


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