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Q.

 If the pointx1+tx2x1,y1+ty2y1,z1+tz2z1 divides the line segment joining  x1,y1,z1 and x2,y2,z2  internally then 

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a

t<0

b

0<t<1

c

t>1

d

t=1

answer is B.

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Detailed Solution

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The ratio in which the point (x1,y1)=(x1+t(x2x1),y1+t(y2y1),z1+t(z2z1)

Divide the line segment  joining (x1,y1,z1) and (x2,y2,z2) is x1xxx2=y1yyy2=z1zzz2=mn

x1(x1+t(x2x1))x1+t(x2x1)x2=t(x2x1)(x2x1)(t1)=t1t>0

tt1<0t(t1)<0, 0<t<1

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