Agree, adults are damn self—confident creatures. And if you, like all normal parents, sometimes boil over because for some reason your child cannot understand what is obvious to you, like two and two, then here is the opposite case. Here is an ordinary problem for schoolchildren, which 9 out of 10 will solve without any problems. Well, shall we crack our brains?
Imagine that you are participating in a TV show, and there are three doors in front of you. Behind one of them is a brand—new car, behind the other two - nothing, well, or a goat. The presenter, who knows where the prize is, suggests that you first choose (but not open) any door, then opens one of the two remaining ones, behind which there is definitely emptiness, and suggests changing your initial choice. What will you do? According to most people, including mathematicians, the answer is counterintuitive, but probability theory works flawlessly. Now let's explain why.
We often like to scold school problems, they say, the conditions in them are sometimes so absurd and absurd that it is completely confusing. And instead of starting to make a decision after reading the conditions, we spend time criticizing. Popular mechanics has picked up for you a bearded problem from basic mathematics, in which everything is in order with the condition. Even for high school humanities students, it takes a few minutes to solve it, and how long will it take you?
Even the simplest questions can seriously puzzle: especially those who have long forgotten about textbooks and notebooks.
Learning to quickly count percentages in your head is not an easy task, especially when it comes to difficult-to-perceive numbers. However, Twitter users have shared a simple mathematical trick that will allow you to easily master one of the most complex types of calculations without the help of a calculator!
Monday is a hard day, so we suggest solving a simple problem for ingenuity.
Sometimes we publish tasks: some for knowledge of geometry, some for the ability to solve equations, some for ingenuity. This time we suggest juggling variables. The answer is after the task condition.
To solve this problem, you will need not so much mathematics as ingenuity.
Cards and chess are an endless source of inspiration for mathematicians: using the example of cards in a deck and rows of white and black pieces on the board, you can illustrate both simple arithmetic and complex probability theory. We offer you a rather difficult problem, known as the problem of the sharper and the grandmaster.
PM offers to solve three selected puzzles from the collection Pythagoras Magazine - a world-famous magazine about entertaining mathematics.