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Find a unit vector in the direction from...

Find a unit vector in the direction from point `P(1,-1,2)` to point `Q(-1,1,1)`.

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The correct Answer is:
`(-2 hat (i) + 2 hat(j) - hat (k))/(3)`
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RESONANCE-DAILY PRACTICE PROBLEM-DPP No.3
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  13. The radius of curvature of a plane mirror of length 40 cm is :

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