Q:

Consider the cipher text message with relative frequencies:

0

4 0 10 25 5 32 24 15 6 11 5 5 1 2 6 6 15 19 10 0 6 28 8 2 3 2
The Index of Coincidence is


  1. 0.076
  2. 0.066
  3. 0.067
  4. 0.050

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(c).0.067

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