Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

You stand in front of two doors. A guard stands next to each door. You know the following things: one path leads to paradise, the other leads to death. You cannot distinguish between the two doors. You also know that one of the two guards always tells the truth and the other always lies. You have permission to ask one guard one question to discover which door leads to paradise. What one question would you ask to guarantee you enter the door to paradise?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

If eleven plus two equals one, what does nine plus five equal?

I’m tall when I’m young, and I’m short when I’m old. What am I?

Why is the Hole below a Lock?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Out of four images which one is the odd one out?

Can you find out which options fits best with the missing column?