1.

a.b and c are three vectors such that |a| =1, |b| = 2, |c| = 3 and b,c are perpendicular. If projection of both is the same as the projection of c on a, then |a - b + c| is equal to

Answer»

`SQRT(2)`
`sqrt(7)`
`sqrt(14)`
`sqrt(21)`

Answer :C


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