Vectors 1 Question 23

24. The points with position vectors a+b,ab and a+kb are collinear for all real values of k.

(1984, 1M)

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Answer:

Correct Answer: 24. (b)

Solution:

  1. Let position vectors of points A,B and C be a+b,ab and a+kb, respectively.

(ab)(a+b)=(a+kb)(ab)2b=(k+1)bk+1=2k=3

Hence, it is false statement.



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