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

If the angles of elevation of the top of a tower from three colinear 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

`sqrt3:1`

B

`sqrt3:sqrt2`

C

`1:sqrt3`

D

`2:3.`

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The correct Answer is:
A
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