1 - An art museum official chose 4 paintings at random from among 20 paintings, to be displayed in one of the exhibitions.

2- What is the probability that 3 of them are by one artist participating in 8 paintings in the museum?

3- A soccer team won 75.7% of its matches. Find the probability that he will win at least 7 out of his next 10 matches

4 - Find the slope of the tangent to the curve of the function y = x² - 5x at the given point (0, 5).