How to solve Logical Reasoning questions using Venn Diagrams

The question is as follows:-

All Doctors are Physicians. All Physicians are graduates. All pediatricians are doctors. All actors are graduates.

Conclusions:-
I. Some physicians are actors.
II. Some doctors are actors.
III. All pediatricians are graduates.
IV. All doctors are graduates.

1) All follow
2) Only III and IV follow
3) Only II,III and IV follow
4) Only I,III and IV follow
5) Only I and II follow

Ans)
Now to solve these type of questions, you must always draw Venn diagrams according to the statements given. In our case the venn diagram wud be as depicted:-



Now it is not given the actors are alos some other thing than being graduates. So we have not shown the intersection of Actors' circle with other cirlces. From the Venn diagram it is evident that we can surely say that III and IV follow. Regarding I and II they might be true or false. We cant say about I and II with surety.

So mark option 2.