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Let vec r , vec a , vec ba n d vec c be...

Let ` vec r , vec a , vec ba n d vec c` be four nonzero vectors such that ` vec rdot vec a=0,| vec rxx vec b|=| vec r|| vec b|a n d| vec rxx vec c|=| vec r|| vec c|dot` Then `[abc]` is equal to `|a||b||c|` b. `-|a||b||c|` c. `0` d. none of these

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