Mathematics
Mathematics, 09.08.2019 12:10, salmamontero1998

Each person, in an it department of 60 people, works on at least one of 3 major projects: system security, program implementation, platform development. 23 people work on system security, 28 work on program implementation, and 26 work on platform development. 7 people work on system security and platform development, 12 people work on program implementation and platform development, and 6 people work on all three projects. how many people work only on system security and program implementation (i. e., not all three projects)?
answer either: 4, 5 or 6

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