7      13        25        49        97        194      385

  • 13
  • 49
  • 97
  • 194
  • 25
  • Explanation:

    Solution is,

    7×2-1=13

    13×2-1=25

    25×2-1=49

    49×2-1=97

    97×2-1=193

    193×2-1=385

    so 194 is wrong

     

7      13        25     &
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