If `O(0,0,0), P(3,4,5), Q(m,n,r)` and `R( 1, 1, 1)` be the vertices of a parallelogram taken in order, then what is th

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Q 2309367218.     If `O(0,0,0), P(3,4,5), Q(m,n,r)` and `R( 1, 1, 1)` be
the vertices of a parallelogram taken in order, then
what is the value of `m + n + r`?
NDA 2010 Paper 1
A

`6`

B

`12`

C

`15`

D

More than `15`

HINT


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

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