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[" Two vertical poles of heights,"20m" and "80m" stand "],[" a part on a horizontal plane.The height (in meters) "],[" of the point of intersection of the lines joining the "],[" top of each pole to the foot of the other,from "],[" this horizontal plane is : "],[[" (1) "12," (2) "15," (3) "16," (4) "18]]

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