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0,
5
2
,
5
4
A
5
2
,
5
2
,
5
4
B
D
C
5
2
,0,
5
4
5
2
,
5
4
,0
��+��+��+��=0,
��−��+��−��+��−��
+��−��=0,
⇒4��−(��+��+��+��)=0,
⇒��=
??????�+??????�+??????�+??????�
4
⇒��=0,
10
4
,
5
4
�.�.0,
5
2
,
5
4
Solution:
If the position vector of the points �,�,�,�are 0,2,1,3,1,1,−5,3,2
(2,4,1)respectively and if ��+��+��+��=0,then the position
vector of �is