Problem of the Week

There are 25 red balls and 25 blue balls in a bag. Alice and Bob take turns drawing balls from the bag without replacement, with Alice going first. Interestingly, they notice

Hundreds of years ago, scientists believed that air was a pure substance which, alongside earth, wind and fire, made up all matter on Earth. Nowadays, we know that air is a

An unreliable typist is trying to type ‘Eton College’ into their Chronicle article, but cannot guarantee that the order of the letters are correct. Thus he may type ‘Eetgne ooCll’ or

One of the CCF’s guns is designed such that it can launch a projectile of mass 10 kg at a speed
of 200 m/s. The gun is placed close to a

                There are 100 lockers that line the main hallway of Holyport. Every morning, the security guards make sure that all of the lockers are closed so that there will be an

          Alan and Claire live by the old Scottish saying, “Never have whiskey without water, nor water without whiskey!” So one day, when Alan has in front of him a glass of

                The evening after national lockdown was lifted, a couple decided to celebrate their newfound freedom at a bar down the street. Much to their surprise, they find four other couples

You want to create a family tree, but you are having trouble tracking down your grandmother’s birthdate. The only clue you found was a letter written from your great grandfather to