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If the points a+b,a-b and a+kb be collin...

If the points `a+b,a-b and a+kb` be collinear, then k is equal to

A

A. 0

B

B. 2

C

C. `-2`

D

D. any real number

Text Solution

Verified by Experts

The correct Answer is:
D
`(a-b)-(a+b)=[(a+kb)-(a-b)]`
`implies -2b=(k+1)b`
Hence, `k in R`
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