Study the given diagram carefully and answer the question. The numbers in different sections indicate the number of persons. What does region ‘13’ represent?
1
The numbers of painters who are only plumbers and neither watchmen nor carpenters.
2
The number of painters who are plumbers and also watchmen but not carpenters.
3
The number of carpenters who are only watchmen.
4
The number of painters who are only watchmen.