A line passes through the point whose position vectors are i→+j→-2k→ and i→-...

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A line passes through the point whose position vectors are i→+j→-2k→ and i→-3j→+k→. The position vector of a point on it at a unit distance from the first point is
(a) 15(6i→+j→-7k→)
(b) 15(4i→+9j→-13k→)
(c) i→-4j→+3k→)
(d) none of these
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