1.

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

Answer»

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

Answer :C


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