Working systematically
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problemFavouriteTelescoping series
Find $S_r = 1^r + 2^r + 3^r + ... + n^r$ where r is any fixed positive integer in terms of $S_1, S_2, ... S_{r-1}$.
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problemFavouriteRain or shine
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.
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problemCrazy cannons
Two cannons are fired at one another and the cannonballs collide... what can you deduce?
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problemA very shiny nose?
This problem explores the biology behind Rudolph's glowing red nose, and introduces the real life phenomena of bacterial quorum sensing.
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problemAdding machine
Can you set the logic gates so that this machine can decide how many bulbs have been switched on? -
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problemFavouritePut out
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?