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Le Monde puzzle [poll]

November 1, 2017

As the 25 Le Monde mathematical puzzles have now been delivered (plus the extraneous #1021), the journal is asking the players for their favourites, in order to separate ex-aequos. For readers who followed the entire sequence since puzzle #1001, what are your favourite four puzzles? (No more than four votes!)

wet summer reads [book reviews]

September 24, 2017

“‘Oh ye of little faith.’ Rebus picked up his lamb chop and bit into it.” Ian Rankin, Rather be the Devil Rebus’ latest case, a stray cat, a tree that should not be there, psychological worries in Uppsala, maths formulas, these are the themes of some of my vacation books. I read more than usual […]

Le Monde puzzle [#853]

February 13, 2014

Yet another one of those Le Monde mathematical puzzles which wording is confusing (or at least annoying) to me: A political party has 11 commissions, to which belong some of the 13 members of the central committee. A token is given to each member for each commission whom he or she belongs. Two different members […]

Le Monde puzzle [#848]

December 28, 2013

The X’mas version of Le Monde mathematical puzzles: A shop sells X’mas trees (with 25 models which prices range from 36€ to 65€), X’mas fairy lights (with 18 models which prices range from 6.50€ to 27€), and X’mas balls (with 13 models which prices range from 9€ to 17.50€). A lot is made of a model from […]

Le Monde puzzle [#845]

December 21, 2013

Yet another one of those Le Monde mathematical puzzles which wording is confusing to me: Take the set of integers between 1 and 1000. endow all of them randomly with red or blue tags. group them by subsets of three or more (grapes). and also group them by pairs so that a switch can change […]