Question

Which region represents only young persons?

Answer 1

Region 6 is at the intersection of all the three sections hence it represents young, uneducated and employed person.
Educated, employed young persons implies those people who are employed and young but do not belong uneducated group. Such a region is 7. Young persons are represented by 1.
Young and uneducated people are represented by both 3 and 6.