What does this Rebus Picture mean?

Can you replace the question mark with the correct number in the below table sequence?

What country can make you shiver?

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 5-letter word typed in all capital letters can be read the same upside down?

You can see it everyday, But cannot touch it at will. What is it?

Can you count the number of lines in the below picture?

Pronounced as 1 letter, And written with 3, 2 letters there are, and 2 only in me. I’m double, I’m single, I’m black blue and grey, I’m read from both ends, and the same either way. What am I?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

Which alphabet letter is a question?