[" 21.If "2" is a root of a "x^(2)+bx+c=...

[" 21.If "2" is a root of a "x^(2)+bx+c=0" then point "],[" concurrence of lines "ax+2by+3c=0" is "],[[" 1) "(12,3)," 2) "(4,2)," 3) "(1,2)," 4) "(2,3)]]

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