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The points (a + 1, 1), (2a + 1, 3) and (...

The points (a + 1, 1), (2a + 1, 3) and (2a + 2, 2a) are collinear, if :

A

`a = -1, 2`

B

`a = 1/2, 2`

C

a = 2, 1

D

`a=-1/2, 2`

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