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Question

If the centroid of tetrahedron OABC where A,B,C are given by (a,2,3),(1,b,2) and (2,1,c) respectively is (1,2,2), then distance of P(a,b,c) from origin is

A
195
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B
14
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C
10714
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D
13
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Solution

The correct option is A 195
The Centroid of tetrahedron OABC with vertices O(0,0,0),A(a,2,3),B(1,b,2) and C(2,1,c) is G(a+34,b+34,5+c4).
Comparing the coordinates of the Centroid G with the given coordinates of centroid (1,2,2), we get
a=1,b=5,c=13
distance of P(1,5,13) from origin O(0,0,0) is
D:12+52+(13)2=195

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