If u.v.w are three vectors such that each is inclined at an angle of " with the other two, and that lul = 1. Ivl = 2. and Iwl =3. Then the scalar product of the vectors 2u + 4v- 5w and 4u- 6v+10w is equal to O -514 O -522 O -334 O 188 O none of the choices

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