This is part of our Secondary Curriculum collection of favourite rich tasks arranged by topic.

Scroll down to see the complete collection, or explore our subcollections on Perimeter and Area in two dimensions, and Surface Area and Volume in three dimensions.

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### Which spinners?

Can you work out which spinners were used to generate the frequency charts?

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### Last one standing

Imagine a room full of people who keep flipping coins until they get a tail. Will anyone get six heads in a row?

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### Who's the winner?

When two closely matched teams play each other, what is the most likely result?

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### Chances are

Which of these games would you play to give yourself the best possible chance of winning a prize?

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### The Better Choice

Here are two games you can play. Which offers the better chance of winning?

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### Same Number!

If everyone in your class picked a number from 1 to 225, do you think any two people would pick the same number?

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### Odds and Evens made fair

In this follow-up to the problem Odds and Evens, we invite you to analyse a probability situation in order to find the general solution for a fair game.

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### In a box

Chris and Jo put two red and four blue ribbons in a box. They each pick a ribbon from the box without looking. Jo wins if the two ribbons are the same colour. Is the game fair?

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### Mathsland National Lottery

Can you work out the probability of winning the Mathsland National Lottery?

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*ou may also be interested in this collection of activities from the STEM Learning website, that complement the NRICH activities above.*