1.

Let vec(a)=2hati+hatj-2hatk and vec(b)=hati+hatj. Let the vector vec( c ) is such that |vec( c )-vec(a)|=3,|(vec(a)xx vec(b))xx vec( c )|=3. The angle between vec( c ) and vec(a)xx vec(b) is 30^(@). Then vec(a).vec( c ) = ……………

Answer»

`(1)/(8)`
`(25)/(8)`
2
5

Answer :C


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