If the angles of elevation of the top of...

If the angles of elevation of the top of 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

`sqrt(3) : 1`

`sqrt(3) : sqrt(2)`

`1 : sqrt(3)`

`2 : 3`

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