1.

Vector vec(a)=hati-hatj,vec(b)=hati+hatj+hatk. The vector vec( c ) is such that vec(a)xx vec( c )+vec(b)=0 and vec(a).vec( c )=4 then |vec( c )|^(2) = ……………

Answer»

8
`(19)/(2)`
9
`(17)/(2)`

Answer :B


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