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Angles of elevatiobn of the top of a tow...

Angles of elevatiobn of the top of a tower from three points (collinear) A,B and C on a road leading to the foot of the tower are `30^(@) ,45^(@)` and `60^(@)` respectively .The ratio of AB to BC is

A

`sqrt(3):1`

B

`sqrt(3):2`

C

`1:2`

D

`2:sqrt(3)`

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