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Ans D

Total number of students = 100

Number of students who play football = 20
So we can calculate Number of students who do not play football = 100-20 = 80

Number of students who do not play Rugby = 20
So we can calculate the Number of students who play Rugby = 100-20 = 80

Number of students who do not play neither of the game = 10

Number of students who played both = Number of students who played football - Number of students who played Neither of sport = 20-10 = 10
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GIVEN:
The total students = 100
The total students playing football = 20
The total students not playing rugby = 20
The total students neither playing football nor playing rugby= 10
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