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Q.

The line segment joining the points A(2,1)   and B(5,8)   is trisected at the points P  and Q   such that P   is nearer to A  . Find the coordinates of P and Q.


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a

P(3,2)andQ=(4,5)  

b

P(3,2)andQ=(4,5)  

c

P(3,2)andQ=(4,5)  

d

P(3,2)andQ=(4,5)   

answer is D.

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Detailed Solution

It is given that
P and Q are the points of trisection of the line segment joining the points A(2,1) and B(5,-8).
We know that,
If points M and N divide the line segment XY into three equal parts, then M divides XY in the ratio of 1:2 and N divides XY in the ratio of 2:1.
Then point P divides the line AB in the ratio of 1:2 and Q divides the line AB in the ratio of 2:1.
Then,
We know that, if point O divides the line segment joining Mx1,y1 and N(x2,y2) in the ratio m1:m2, then the coordinates of O will be
m 1 x 2 + m 2 x 1 m 1 + m 2 , m 1 y 2 + m 2 y 1 m 1 + m 2  .
By using above section formula,
Coordinates of the point P is
P= 1×5+2×2 1+2 , 1×(8)+2×1 1+2 P= 5+4 3 , 8+2 3 P= 9 3 , 6 3 P=(3,2)   Similarly,
Coordinates of the point Q is
Q= 2×5+1×2 2+1 , 2×(8)+1×1 2+1 Q= 10+2 3 , 16+1 3 Q= 12 3 , 15 3 Q=(4,5)  
Therefore,
P(3,2)andQ=(4,5)  .
Hence, option (4) is correct.
 
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