A problem by Shreyash Taori

Level pending

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?

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