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A survey is conducted among $275$ families. $100$ families among them use air condition (A.C.) $70$ families use only coolers, $60$ families use only AC and $80$ families use only fan. $10$ families use all three and $10$ families use none of these.

How many families use both a cooler and a fan?

  1. 20  
  2. 25
  3. 40 
  4. 30
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