A problem by Shreyash Taori

Level 2

In a group of persons working in a software company, 6 persons can operate on DOS, 15 can operate on windows operating system and 6 can operate on Linux. In that group none can operate on any other operating system. If 2 persons in the group can work on two operating systems and one person can work on all the three, then how many persons are there in the group?

22 24 23 21

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