Question: A camp-fire was attended by 49 friends. After shaking hands, each of them sat on the round table and clinked their mug with the friends to his immediate left and immediate right. How many times did the mugs clink?
Answer:
Let's assume that everyone clinked their mug with friend to his left only. It means that there are total 49 clinks. Now the right clink of each person is left clink of the person on right which is already happened. Hence, there are only 49 clinks