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

What is the next number in the series?

15 29 56 108 208 ?

Jack have ten pairs of black socks, eight pairs of white socks and seven pairs of green socks. Everything is mixed in a draw. As there is no light he were not able to identify the colour of the socks. How many of the socks did he want to take to match one pair

What is so fragile that saying its name breaks it?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

At a bar, three friends, Mr Green, Mr Red and Mr Blue, were having a drink. One man was wearing a red suit; one a green suit; and the other a blue suit. 'Have you noticed,' said the man in the blue suit, 'that although our suits have colours corresponding to our names, not one of us is wearing a suit that matches our own names?' Mr Red looked at the other two and said, 'You're absolutely correct. What colour suit is each man wearing?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

Why do people go to bed?

Why Aeroplane windows are round?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes