1.

The vectors vec(a),vec(b),vec(c) are such that the projection of vec(c)" on "vec(a) is equal to the projection of vec(c)" on "vec(b). If |vec(a)|=2,vec(b)|=1,|vec(c)|=3andvec(a).vec(b)=1, then |vec(a)-2vec(b)-vec(c)| is equal to

Answer»

3
`sqrt(10)`
`sqrt(12)`
`sqrt(13)`

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