The points \( (a+1,1),(2 a+1,3) \) and \( (2 a+2,2 a) \) are collin...
The points \( (a+1,1),(2 a+1,3) \) and \( (2 a+2,2 a) \) are collinear, if
(a) \( a=-1,2 \)
(b) \( a=\frac{1}{2}, 2 \)
(c) \( a=2,1 \)
(d) \( a=-\frac{1}{2}, 2 \)
\( \mathrm{P} \)
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