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If the angles of elevation 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 `30^0` , `45^0` and `60^0` respectively, then the ratio, AB : BC, is : (1) `sqrt(3):1` (2) `sqrt(3):sqrt(2)` (3) `1:sqrt(3)` (4) `2"":""3`

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