If `P, Q, R, S` are the points `(2, 3, -1), (3, 5,- 3)`, `(1, 2, 3), (3, 5, 7)` respectively. Then the projection of

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Q 2127078881.     If `P, Q, R, S` are the points `(2, 3, -1), (3, 5,- 3)`,

`(1, 2, 3), (3, 5, 7)` respectively. Then the projection of `PQ`

on `RS` is ......... and hence `PQ` and `RS` are `........................ ..`
A

`1`, perpendicular

B

`-1`, perpendicular

C

`0`, perpendicular

D

`2`, perpendicular

HINT


Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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