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## Miscellaneous Exercise on Chapter 11 1. Three vertices of a parallelogram ABCD are
A
(
3
,
−
1
,
2
)
,
B
(
1
,
2
,
−
4
)
\mathrm{A}(3,-1,2), \mathrm{B}(1,2,-4)
A
(
3
,
−
1
,
2
)
,
B
(
1
,
2
,
−
4
)
and
C
(
−
1
,
1
,
2
)
\mathrm{C}(-1,1,2)
C
(
−
1
,
1
,
2
)
. Find the coordinates of the fourth vertex.
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