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Question

A guard of 12 men is formed form  soldiers If A and B are three times as often together on guard as C,D, E then =

  1. 16    
  2. 32    
  3. 64    
  4. 8    

The correct answer is: 32


    Include A,B in 12 = 3 (include C, D, E)
    n - 2 C10 = 3n - 3 C9

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