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?

Can you count the number of matches in the picture below ?

What English word has three consecutive double letters?

Which letter of the alphabet has the most water?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

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What always comes into a house through the keyhole?

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John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

What does the below image rebus riddle means ?