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The angles of elevation of the bottom a...

The angles of elevation of the bottom and the top of the tower fixed at the top of a 20m high building, from a point on the ground are `45^@` and `60^@` respectively. The height of the tower is

A

`20(sqrt3-1)m`

B

`20(sqrt3+1)m`

C

`3( 1+sqrt3)m`

D

none of these

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The correct Answer is:
A
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