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Let ` vec u , vec v` and `vec w` be vectors such that ` vec u+ vec v+ vec w=0.` If `| vec u|=3,| vec v|=4` and `| vec w|=5,` then ` vec u. vec v+ vec v.vec w+ vec w.vec u` is a.`47` b. `-25` c. `0` d. `25`

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