Find the number of ways to p...
Find the number of ways to place three black pawns on a chessboard.Correct answers: 23
The first user who solved this task is Neelima Subrahmanyam.
#brainteasers #math
NYC open-burning banIn 1962, an ordinance banning the open-burning of leaves, trees, shrubbery or plants on land within New York City took effect. The action reflected concern over air pollution and its effect on health, and another control against smog. Builders and building wreckers were granted a two-year exemption. The law was signed by the Mayor on 30 Nov 1961. New York State followed this example in 1972, applying the measure state-wide to cities with population over 20,000. Giving increasing attention to air pollution, New York State ended the exemption for smaller communities, and extended the state's ban to everywhere in throughout the state from 15 Oct 2009.« |