Out of 450 students of a school, 325 play football, 175 play cricket and 50 either play football or cricket. How many students play both football and cricket?
A. 75 B. 100 C. 225 D. 150

• n(football Union Cricket)=450-50=400
  n(football intersection cricket)=n(football)+n(cricket)-n(football Union Cricket)=325+175-400=100
  
  So, 100 students play both football and cricket.
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