What is both possible and impossible at the same time?

Can you fill the blank with the correct number?

6 30 870 756030 _____

Find the 8 in the below-given Image.

People are waiting in line to board a 100-seat aeroplane. Steve is the first person in the line. He gets on the plane but suddenly can't remember what his seat number is, so he picks a seat at random. After that, each person who gets on the plane sits in their assigned seat if it's available, otherwise, they will choose an open seat at random to sit in. The flight is full and you are last in line. What is the probability that you get to sit in your assigned seat?

What English word has three consecutive double letters?

What do you see in the image below

They are three errirs in this question. Can you find them?

A person was found dead on a big green land with no trees or buildings around. When the police arrived, they found a piece of rock lying next to him and the man was wearing clothes comprising of red, blue and yellow colours.

Can you tell who the person is and what was the cause of death?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

Solve the following series:
AZ, GT, MN, __, YB