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[" 14.If the angles of clevation of the top of a tower from three "],[" collinear points "A,B" and "C" ,on a line leading to the foot of the "],[" tower,are "30^(@),45^(@)" and "60^(@)" respectively,then the ratio,"AB" : "],[BC," is: "],[[" (a) "1:sqrt(3)," (b) "2:3]]

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