Problems related to sets and groups

anirban_lax wrote:Hi

Does anyone know of any good practice material for problems relating to groups and sets (). I'm having a torrid time with this type and spending way too much time in solving them during the practice tests. The D-day is coming close...20 days to go. Can you please help me out and point me to some good material that is available? It wil be very helpful.

Thanks

https://www.math.poly.edu/courses/projec ... node4.html

Let me be a little more specific about my request. I'm looking for some good practice material or strategy material on problems relating to situations where we have a set of S people and out of of them a group of G1 people does something and a group G2 people does something else. We are needed to find how many do it together, how many do only action A and how many only action B et al.
For example, in a party there are 200 people and 75 of them had coffee while 100 had both coffee and tea. How many had tea only?

I can deduce some of them pretty fast while I'm locking horns with the others for a long time, loosing precious time over a single problem. I understand I need a new way of thinking about these type of problems. Your help will be greatly appreciated.

@Sanju - Sorry for not being more specific, but thanks anyways, for your time.

Thanks
Anirban