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If t_(1) ne t_(2) ne t_(3) and the lines t_(1)x+y=2at_(1)+at_(1)^(3),t_(2)x+y=2at_(2)+at_(2)^(3), t_(3)x+y=2at_(3)+at_(3)^(3) are concurrent then t_(1)+t_(2)+t_(3) is

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ANSWER :A


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