Working systematically

  • The Koch Snowflake
    problem

    The Koch snowflake

    Age
    16 to 18
    Challenge level
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    Explore the strange geometrical properties of the Koch Snowflake.

  • Telescoping series
    problem
    Favourite

    Telescoping series

    Age
    16 to 18
    Challenge level
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    Find $S_r = 1^r + 2^r + 3^r + ... + n^r$ where r is any fixed positive integer in terms of $S_1, S_2, ... S_{r-1}$.

  • Rain or Shine
    problem
    Favourite

    Rain or shine

    Age
    16 to 18
    Challenge level
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    Predict future weather using the probability that tomorrow is wet given today is wet and the probability that tomorrow is wet given that today is dry.

  • Ante Up
    problem

    Ante up

    Age
    16 to 18
    Challenge level
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    Use cunning to work out a strategy to win this game.
  • Max throw
    problem

    Max throw

    Age
    16 to 18
    Challenge level
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    At what angle should you throw something to maximise the distance it travels?

  • Crazy Cannons
    problem

    Crazy cannons

    Age
    16 to 18
    Challenge level
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    Two cannons are fired at one another and the cannonballs collide... what can you deduce?

  • A Very Shiny Nose?
    problem

    A very shiny nose?

    Age
    16 to 18
    Challenge level
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    This problem explores the biology behind Rudolph's glowing red nose, and introduces the real life phenomena of bacterial quorum sensing.

  • Adding machine
    problem

    Adding machine

    Age
    16 to 18
    Challenge level
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    Can you set the logic gates so that this machine can decide how many bulbs have been switched on?
  • Put Out
    problem
    Favourite

    Put out

    Age
    16 to 18
    Challenge level
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    After transferring balls back and forth between two bags the probability of selecting a green ball from bag 2 is 3/5. How many green balls were in bag 2 at the outset?