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If the anlges 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^@ , 45^@ "and " 60 ^@` respectively , then the ratio AB:BC is

A

`1:sqrt(3)`

B

`2:3`

C

`sqrt(3) : 1`

D

`sqrt(3) : sqrt(2)`

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The correct Answer is:
C
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