In the four images below, can you find the odd one out?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

A girl was sitting in her hotel room when she heard a knock on the door. She opened the door and found that a man was standing outside. The man said, "Oh! I am really sorry, I thought this was my room." He then walked through the corridor to the elevator. The girl did not know the man. She closed her door and called security asking them to apprehend the man. What made her suspicious of that man? He might have been genuinely mistaken.

John is the son of Jacob.
So,
Jacob is the_____of John's father?

A man is found dead with a knife in his back When the investigation is done. A chair lays beside him and the forensic team finds moisture around the body.

If he committed suicide, how did he do it?

Decode the movie name from the below picture?

We have arranged an array of numbers below. What you have to do is use any kind of mathematical symbol you know excluding any symbol that contains a number like cube root. You can use any amount of symbols but you have to come up with a valid equation for all of them.

0 0 0 = 6
1 1 1 = 6
2 + 2 + 2 = 6
3 3 3 = 6
4 4 4 = 6
5 5 5 = 6
6 6 6 = 6
7 7 7 = 6
8 8 8 = 6
9 9 9 = 6

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

What 5-letter word typed in all capital letters can be read the same upside down?