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normalized floating point number

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Consider the following 16-bit format for normalized floating point numbers with bi as 15 
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what is the maximum difference between two representable consecutive numbers.

  1.  210
  2.  215
  3.   25
    Explanation:
    max difference = Largest number - 2nd largest number
    = 1.1111 1111 11 x 230-15 - 1.1111 111 10 x 230-15
    =0.0000 0000 01 x 215
    =2-10 x 215
    =25
  4. 1

 Can plz somebody explain this.??

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