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2015-04-20T17:53:33+05:30

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We want irrational number  and not rational number.

   7/2 = 3.5    and  2/5 = 0.4
    
between  0.4 and  3.5
  square  0.4  and  3.5    =>    0.16  and  12.25
   take any number between them which is not a perfect square.
             2,  3, 5 ,    7, 8, 6, 10, 11, 12
 so
       √2, √3, √5 , √7,  √6, √8, √10, √11, √12    are all irrational numbers between  7/2 and 2/5.

1 5 1