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

[" 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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