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A famous riddle that involves an informal fallacy and a discrepancy in the math problem. Learn the solution, the trick, and the variations of this puzzle that dates to at least the 1930s.
Learn the concept of time value of money, which is the idea that receiving money now is better than later. Find out how to calculate present and future values, annuities, and interest rates using formulas and examples.
This web page provides a comprehensive overview of various mathematical problems that have not been solved yet, ranging from algebra to topology. It also includes lists of unsolved problems proposed by different mathematicians and organizations, such as the Millennium Prize Problems and the Clay Mathematics Institute.
Learn about the mathematical analysis of "collect all coupons and win" contests, also known as the cereal box problem. Find the expected number of trials, the limit distribution, and the generalizations of the problem.
A list of free and open-source software for high-order mathematical calculations, such as computer algebra systems, geometry, numerical analysis, and more. Learn about the history, features, and applications of each software, as well as the licenses and platforms they support.
Shakuntala Devi was an Indian mental calculator, astrologer, and writer, popularly known as the "Human Computer". She achieved a world record in 1980 for multiplying two 13-digit numbers in 28 seconds, and wrote a pioneering book on homosexuality in India.
Solution of a travelling salesperson problem: the black line shows the shortest possible loop that connects every red dot. The travelling salesman problem, also known as the travelling salesperson problem (TSP), asks the following question: "Given a list of cities and the distances between each pair of cities, what is the shortest possible route that visits each city exactly once and returns ...
A percentage is a number or ratio expressed as a fraction of 100, often denoted by the percent sign (%). Learn how to compute percentages, their history, and how to use them to compare proportions, changes, and rates.