How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?
Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?
There are nine dots in the picture that has been attached with this question. Can you join all the dots by drawing four straight lines without picking up your pen?
A doctor and a boy were fishing. The boy was the doctorâ€™s son, but the doctor was not the boyâ€™s father. Who was the doctor?
How can you take 2 from 5 and leave 4?
What brings you down but never up?
You have $100 with you and you have to buy 100 balls with it. 100 is the exact figure and you can't go below or above the numbers and you have to use the entire $100. If there is no kind of tax applied how many of each of the following balls will you be able to buy:
Green Balls costing $6
Yellow Balls costing $3
Black Balls costing $0.10
Now, how many of each must you buy to fulfil the condition given?
On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.
Is this even possible? How can it be?
Which is the correct shadow of the bird?
Identify the hidden meaning behind this picture?
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.