(a). 110
(b). 95
(c). 2
In the question,
Number of students who played Basketball = 99
Number of students who played Volleyball = 9
Number of students who played Soccer = 10
Number of students who played Basketball and Soccer only = 1
Number of students who played Volleyball and Soccer only = 2
Number of students who played Basketball and Volleyball only = 1
Number of students who played Basketball, Volleyball and Soccer only = 2
So,
We can see from the Venn diagram shown below,
Number of students who played only Basketball = 99 - (1 + 2 + 1) = 95
Number of students who played only Volleyball = 9 - (1 + 2 + 2) = 4
Number of students who played only Soccer = 10 - (1 + 2 + 2) = 5
(a).
Number of students who played atleast one of three sports = Sum of all the sections in the Venn Diagram
= (95 + 1 + 2 + 1) + (4 + 2) + 5 = 110
(b).
Students who played Basketball only = 95
(c).
Number of students who play Volleyball and Soccer but not Basketball = 2