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Q.

 If x1,x2,x3 as well as y1,y2,y3 are in GP, with same common ratio, then the points x1,y1,x2,y2 and x3,y3

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a

are vertices of a triangle

b

lie on an ellipse

c

lie on a straight line

d

lie on a circle

answer is A.

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Detailed Solution

Let common ratio of GP is r, then,

 x2=x1r , x3=x1r2 and y2=y1r , y3=y1r2 

Let Ax1,y1,Bx2,y2 and Cx3,y3

  As we know that Area of ABC=12x1y11x2y21x3y31

Thus, Area of ABC=12x1y11x1ry1r1x1r2y1r21=x1y12111rr1r2r21

Since two columns of the determinant is same so 111rr1r2r21=0.

Area of ABC=0

Thus, the three points are collinear or lie on a straight line.

Hence option-1 is the correct answer.

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