why number 8549176320 is one of a kind?

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

Create a number using only the digits 4,4,3,3,2,2,1 and 1. So i can only be eight digits. You have to make sure the ones are separated by one digit, the twos are separated by two digits the threes are separated with three digits and the fours are separated by four digits

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

What breaks yet never falls, and what falls yet never breaks?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

A man was just doing his job when his suit was torn. Why did he die three minutes later?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

You have to put a letter on the following to make it a meaningful word. The only challenge is that you can't use 'E'.

S E Q U E N C _

Queen Elizabeth organised a royal party.

To Avoid uninvited guest royal family set a password.
Jack (an uninvited person) plan to enter the party. He stand nearby the door.

First guest comes, the security person said 'twelve' and guest replied with six.
Second guest comes , the security person said 'six' and guest replied with 'three'.

Jack thought is enough and he walked to the entry point. The security person said 'eight' , Jack replied smilingly 'four'.
He was immediately thrown out of the party. why ?