HP, GP or AP?

Algebra Level 3

If points with coordinates $(a,ma), (b,mb+b)$ and $(c,mc+2c)$ are collinear, which of the following about $a,b,c$ is true?

None of the above They follow a geometric progression for all values of

m

It is dependent on value of

m

They follow a harmonic progression for all values of

m

They follow an arithmetic progression for all values of

m

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