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यदि तीन बिन्दुओ A , B , C के स्थिति सदिश क्रमशः ` hati + hatj +hatk `
` 2hati + 3hatj - 4hatk " तथा" 7hati + 4hatj + 9hatk` हो तो इकाई सदिश हो त्रिभुज ABC
के तल पर लम्ब है , है -
A. `31hati - 38hatj-9hatk`
B. `(31hati - 38hatj-9hatk)/(sqrt(2486))`
C. `(31hati + 38hatj+9hatk)/(sqrt(2486))`
D. इनमे से कोई नहीं

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