The centre of the third figure is empty. What digit should fit inside?

Three ants are sitting at the three corners of an equilateral triangle. Each ant starts randomly picks a direction and starts to move along the edge of the triangle. What is the probability that none of the ants collide?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

I have eight fingers and two thumbs but I do not live. What Am I?

A man embarked on a questionnaire game. He kept asking the same question to whomever he found. The answer each time was different.

Can you guess what the question was?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

In the figure that has been attached to this question, each digit represents a digit. The similar letters carry the same integer value. Can you expose the original digits?

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