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Seen it? Try it.

Pick the experiment from your SumFizz video.

Why do the middle slots win?

How likely is a shared birthday?

Try a different group size

Stay or switch?

Play Monty Hall

Flip a percentage

Try your own numbers

Two discounts, one surprise

Test two discounts

Can you cross the river?

Try the crossing puzzle

Give your savings a head start

Change the numbers

All simulations & puzzles → · Find a calculator →