Three people enter a room and have a green or blue hat placed on their heads. They cannot see their own hat but can see the other hats.
The colour of each hat is purely random. They could all be green, blue, or any combination of green and blue.
They need to guess their own hat colour by writing it on a piece of paper, or they can write 'pass'.
They cannot communicate with each other in any way once the game starts. But they can have a strategy meeting before the game.
If at least one of them guesses correctly they win $10,000 each, but if anyone guesses incorrectly they all get nothing.
What is the best strategy?

During which month do people sleep the least?

By using all numbers, i.e. 123456789 and subtraction/addition, operators number 100 can be formed in many ways.
Example: 98 + 7 + 6 - 5 - 4 - 3 + 2 - 1 = 100

But if we add a condition use of the number 32 is a must. Then there are limited solutions.
One of such solution is: 9 - 8 + 76 + 54 - 32 + 1 = 100

Can you tell me any other solution?

How many letters are in the alphabet?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

My location can be determined by the below rebus.
So where am i ?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Different lights make me strange by changing me into different sizes. What am I?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?