Archive for Aboriginal art
Napaljarri-wanu Jukurrpa
Posted in Statistics with tags Aboriginal art, Aboriginal myths, Australia, Dreaming, Dreamtime, exhibit, Jakamarra, Jukurrpa, Karatgurk, MaAnangu, maps, Musée du Quai Branly, museum, Napaljarri sisters, Ngaanyatjarra, Nungarrayi, Paris, Pitjantjatjara, Pleiades, Quai Branly, songline, The Seven Sisters, Western Australia, Wurundjeri, Yankunytjatjara, Yurlu on May 6, 2023 by xi'an
a genuine riddle
Posted in Books, Kids, pictures with tags Aboriginal art, FiveThirtyEight, logic, Melbourne, The Riddler, urn models on August 5, 2022 by xi'an
A riddle from The Riddler that was pure (if straightforward) logic rather than brute force compulation or mathematical modelling:
Four bags of many marbles are labelled R(ed), B(lue), G(green) and μ (mixed), except that all labels are wrong. Given the possibility to draw two balls, one at a time, from any bag, is it possible to select two monochromatic bags?
Bag μ draw is returning a color, R say, as it is a monochromatic bag. Drawing from another color bag, B say, will produce R or B, in which case it is μ, i.e., mixed (polychromatic), which means the other bags are monochromatic, or G. For this last case, bag B is either polychromatic, in which case bag G is made of blue marbles and bag R of green marbles, or monochromatic, in which case bag G is mixed and bag R is full of blue marbles, but monochromatic for either situation, hence to be chosen on top of bag μ.
