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Q.

A=(2,5),B=(4,11) and the locus of ‘C’ is 9x+7y+4=0 then the locus of the centroid of ABC is

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a

5x+3y7=0

b

24x+22y6=0

c

27x+21y8=0

d

3x+4y2=0

answer is A.

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Detailed Solution

Let c=(α,β) Centriod of ABC is

(x,y)=6+α3,6+β3(α,β)=(3x6,3y+6) substituting in 9x+7y+4=0 is 9(3x6)+7(3y+6)+4=027x+21y8=0

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