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  1. In the units place the possible number can be vary from 0,2,4,6,8 
  2. In the tens place similarly, outcome is the same as number can vary from 0 to 8
  3. But the story is not the same in case of hundredth place as number should be greater than 100 thus the only possible outcome is 2,4,6,8 
  4.  So 4*5*5 = 100 possibilities are there in which all the digits can be even.  
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