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?

What do you get if you add 2 to 100 four times?

Who has married many women but was never married?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

Count the squares in the matchstick puzzle below?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

A girl says this to her best friend: “I was born in 1955, and I celebrated my 17th birthday last weekend.” Her best friend thinks she’s lying, but she’s actually correct. How is that possible?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

What does man love more than life, hate more than death or mortal strife; That which contented men desire; the poor have, the rich require; the miser spends, the spendthrift saves, and all men carry to their graves?