In a locality consisting of 40 families, a survey is conducted on the subscription to various daily news papers S, E, T which revealed the following infomrntion:
6 families subscribe to only S
3 families subscribe to S and E but not T
2 families subscribe to S and T but not E
7 families subscribe to only E
4 families subscribe to E and T but not S
8 families subscribe to only T
and only one family subscribe to all the three.
Using this infonnation, answer the following questions.