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1. |
If the co-ordinates of the points P and Q are `(1,-2,1)and(2,3,4)` and O is the origin, thenA. `OP=OQ`B. `OP_|_OQ`C. `OP||OQ`D. OP and OQ intersect at an angle of `45^(@)` |
Answer» Correct Answer - B |
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