Mba studium

At MBA school, fourth-year students can choose from three optional subjects:
a) mathematical methods,
b) social interaction,
c) management

Each student studies one of these subjects. The mathematical methods studied 28 students, the social interaction 27 pupils, and the management 23 pupils. Seven of them simultaneously study mathematical methods and social interaction, six mathematical methods and management, and five social interaction and management. Two pupils attend all three optional subjects. How many pupils are in the fourth year?

Correct result:

n =  56

Solution:

n=28+27+237652 2=56



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