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Question

Three vertices of a tetrahedron are (0,0,0),(6,5,1) and (4,1,3). If the centroid of the tetrahedron be (1,2,5) then the fourth vertex is

A
(2,4,18)
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B
(1,4,18)
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C

(32,32,74)

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D
none of these
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Solution

The correct option is A (2,4,18)
if the fourth vertex is (x1,y1,z1)
Then 0+64+x1=0,x1=2
similarily 05+1+y1=0y1=4
01+3+z1=20
z1=18
the fourth vertex is (2,4,18)


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