What is the difference between a jeweller and a jailer?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

Mr Black, Mr Gray, and Mr White are fighting in a truel. They each get a gun and take turns shooting at each other until only one person is left. Mr Black, who hits his shot 1/3 of the time, gets to shoot first. Mr Gray, who hits his shot 2/3 of the time, gets to shoot next, assuming he is still alive. Mr White, who hits his shot all the time, shoots next, assuming he is also alive. The cycle repeats. If you are Mr Black, where should you shoot first for the highest chance of survival?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

After undergoing a successful eye operation, A blind girl has just boarded a train to her home. The doctor asked her to open the bandages after 3 hours. On her train journey, she opened the bandages and within a fraction of the time she commits suicide by jumping off the train.

Though her operation was successful, Why did she commit suicide?

A blonde put eyeliner on her head. Why?

How many Watermelons are there in the below picture?

Can you name some countries which do not have the alphabet 'A' in them?

Look at the picture and find out which square is not linked with any of the other squares.