Problem: A survey in a class shows that 15 of the pupils play cricket, 11 play football and 6 play \both cricket and football. How many pupils are there in the class, if everyone plays at least one of these games?
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Correct Answer: 20
Explanation:
Here, Total +All singles-All both= 15 + 11 —6= 26—6=20
Since 6 is counted twice with cricket & football player number,
so 6 has been deducted from the sum of cricket and football players’ number.