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Q:

If  $$\sqrt{a}+\sqrt{b}=15 \ and \ (\sqrt{a}-\sqrt{b} )=3$$ then the value of $$\sqrt{ab/4} $$ is 

  • 1
    $$27\over 2$$
  • 2
    5
  • 3
    6
  • 4
    7
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Answer : 1. "$$27\over 2$$"

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