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if `vecA=i-j, vecB=i+j+k` are two vectors and `vecC` is another vector such that `vecAxxvecC+vecB=vec0` and `vecA.vecC=0` then `|vecC|^(2)=` (a) `9` (b) `8` (c) `(19)/(2)` (d) `(17)/(2)`

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