Revision Time1. In a class of 50 students, 30 students play volleyball

1.	Revision Time1. In a class of 50 students, 30 students play volleyball, 12 students play cricket and the remainingstudents play chess. If one student is selected at random, find the probability that the selected studentplays chess. Also, find the probability that the selected student plays cricket.
Answer» Notice that "7 play both HOCKEY and Cricket" does not MEAN that out of those 7, some does not play Football too. The same for Cricket/Football and Hockey/Football ; ; Those who play ONLY Hockey and Cricket are 7 - 2 = 5; Those who play ONLY Cricket and Football are 4 - 2 = 2; Those who play ONLY Hockey and Football are 5 - 2 = 3; Hence, 5 + 2 + 3 = 10

Revision Time1. In a class of 50 students, 30 students play volleyball, 12 students play cricket and the remainingstudents play chess. If one student is selected at random, find the probability that the selected studentplays chess. Also, find the probability that the selected student plays cricket.

Answer»

Notice that "7 play both HOCKEY and Cricket" does not MEAN that out of those 7, some does not play Football too. The same for Cricket/Football and Hockey/Football

;

Those who play ONLY Hockey and Cricket are 7 - 2 = 5;

Those who play ONLY Cricket and Football are 4 - 2 = 2;

Those who play ONLY Hockey and Football are 5 - 2 = 3;

Hence, 5 + 2 + 3 = 10

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