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Multiple choice

The angle of elevations of the top of the tower from the points distance $a$ and $b$ from the base of tower $(a > b) $ are $30^{o}$ and $60^{o}$, then height of tower is _____________.

  1. $\sqrt {a+b}$
  2. $\sqrt {a-b}$
  3. $\sqrt {ab}$
  4. $\sqrt {\dfrac{a}{b}}$
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