## Le Monde puzzle [#843]

December 7, 2013

A Le Monde mathematical puzzle of moderate difficulty: How many binary quintuplets (a,b,c,d,e) can be found such that any pair of quintuplets differs by at least two digits? I solved it by the following R code that iteratively eliminates quintuplets that are not different enough from the first ones, for a random order of the […]

## Le Monde puzzle [#842]

November 30, 2013

An easily phrased (and solved?) Le Monde mathematical puzzle that does not [really] require an R code: The five triplets A,B,C,D,E are such that and Given that find the five triplets. Adding up both sets of equations shows everything solely depends upon E1… So running an R code that checks for all possible values of […]

## Le Monde puzzle [#840]

November 23, 2013

Another number theory Le Monde mathematical puzzles: Find 2≤n≤50 such that the sequence {1,…,n} can be permuted into a sequence such that the sum of two consecutive terms is a prime number.  Now this is a problem with an R code solution: which returns the solution as and so it seems there is no solution beyond N=12… […]

## Shravan’s comments on “Valen in Le Monde” [guest post]

November 22, 2013

[Those are comments sent yesterday by Shravan Vasishth in connection with my post. Since they are rather lengthy, I made them into a post. Shravan is also the author of The foundations of Statistics and we got in touch through my review of the book . I may address some of his points later, but, […]

## Valen in Le Monde

November 21, 2013

Valen Johnson made the headline in Le Monde, last week. (More precisely, to the scientific blog Passeur de Sciences. Thanks, Julien, for the pointer!) With the alarming title of “Une étude ébranle un pan de la méthode scientifique” (A study questions one major tool of the scientific approach). The reason for this French fame is […]