What has no start, end, or centre?

what does the below rebus means?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

A mother bought three dress for her triplets daughters(one for each) and put the dresses in the dark. One by one the girls come and pick a dress.
What is the probability that no girl will choose her own dress?

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?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

Can you place six X (crosses) in below board without making three in a row in any way ?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

Jigsaw captured 100 people and make them stand in a circle and all these people are labelled as Person1, Person2, Person3... Person100. He made them play a crazy game in which Person 1 shot Person 2 and pass the gun to the next person and so on until one stands alive.

Which person will survive in the end?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?