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If the point (x1+t(x2x1),y1+t(y2y1)) divides the join of (x1,y1) and (x2,y2) internally, then 

a
t<0
b
0
c
t>1
d
t=1

detailed solution

Correct option is B

(x1+t(x2−x1),y1+t(y2−y1))≡(x1(1−t)+tx2,y1(1−t)+ty2) is the point which divides the join of (x1,y1)  and  (x2,y2) in the ration t:(1−t),which is positive if 0

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