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 Aug 17 awarded Scholar Aug 17 accepted Statistical computation in matrix. Rows before columns? riddle.. Aug 16 comment Statistical computation in matrix. Rows before columns? riddle.. Sorry if I'm missing something trivial. Does this version with one "prize ball" is when failing to find the ball with the maximum amount is "bad", or it also solve the case with scores and we want in average the highest score? Maybe it is the same thing. Maybe the method that is more probable to give you the best ball is also the method that will give you in average the highest amount of money, but I fail to see why it will be the case in every condition. If it is a known fact about i.i.d, can you give me a reference? Aug 15 awarded Supporter Aug 15 comment Statistical computation in matrix. Rows before columns? riddle.. About the numerical test. I'm ashamed to show it in a mathematical forum, but I ran a simulation in MATLAB, averaged over 10000 simulations. For $m=2, n=100$: Average for the 1st method (choosing column first) is $0.926$ and for 2nd method is $0.967$. I counted how many times each method was better: 1st>2nd: $0.18$, 2nd>1st: $0.59$, 1st==2n: $0.22$ For $(m,n)=(2,3)$: Avg for 1st: $0.958$ for 2nd: $0.968$. times 1st>2nd: $0.194$, 2nd>1st: $0.234$, 1st==2nd: $0.57$ For $(m,n)=(12,30)$: Avg for 1st: $0.88$ for 2nd: $0.9$. times 1st>2nd: $0.382$, 2nd>1st: $0.547$, 1st==2nd: $0.07$ Aug 15 revised Statistical computation in matrix. Rows before columns? riddle.. added 142 characters in body Aug 15 awarded Student Aug 15 awarded Editor Aug 15 revised Statistical computation in matrix. Rows before columns? riddle.. added 244 characters in body Aug 15 awarded Autobiographer Aug 15 asked Statistical computation in matrix. Rows before columns? riddle..