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Q 3000301218.     A pole is standing erect on the ground which is horizontal. The tip of the pole is tied right with a rope of  \sqrt{12} m to a point on the ground. if the rop is making  30^{\circ} angle with the horizontal, then the height of the pole is

A

 2\sqrt{3}\ m

B

 3\sqrt{2}\ m

C

3\ m

D

\sqrt{3}\ m

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