A king has 1000 bottles of wine, and one of them is poisoned. The poison is so potent that even just a sip of it would be fatal. However, the poison takes effect exactly 30 days after consumption.The king has 10 prisoners at his disposal to find out which bottle is poisoned. He decides to…
Imagine you have a standard 8×8 chessboard and 31 dominoes. Each domino can cover exactly two adjacent squares on the board. The challenge is to cover the entire board using the 31 dominoes. Now, let’s add a twist. Two corners of the chessboard (diagonally opposite corners) are cut out, leaving 62 squares. Can you still…
You’re given two indistinguishable envelopes, each containing money. One envelope contains twice as much money as the other. You may pick one envelope and keep whatever amount it contains. However, after picking, but before opening the envelope, you’re given the chance to switch your envelope with the other one. The question is: Should you switch?…
On a remote island live 100 people with blue eyes and 100 people with brown eyes. Every person on the island is highly logical and aware that there are 100 people with blue eyes and 100 with brown eyes. However, nobody knows their own eye colour; they can only see the eye colours of other…
This one is super tough, so strap in! There are 100 prisoners in solitary cells. There’s a central living room with one light bulb, which is initially off. No prisoner can see the light bulb from his or her own cell. Every day, the warden picks a prisoner equally at random and takes them out…
In the dead of night, four people need to cross a rickety bridge. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge: Person A…
