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RobPratt
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  • Senior R&D Manager, SAS Institute Inc.
  • Ph.D. in Operations Research, The University of North Carolina at Chapel Hill
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Top posts
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40
Fitting the 9th piece into the pizza box
Aug 18, 2024
30
Checkmate 30 kings with rooks
Jun 23, 2022
29
Social distancing in a 5x5 room
Nov 4, 2021
26
Which heptomino is it obvious can't tile the plane?
Feb 18, 2024
25
What node does 11 point to?
Apr 22, 2020
24
A COVID-19 puzzle: How large a class do you need to fit 30 pupils?
May 22, 2020
22
A Rook's Territory in the Chessboard
May 20, 2020
22
Three queens and two rooks covering the chess board... again!
Feb 8, 2021
20
How many ways can you find the word DIAMOND in this diamond?
May 26, 2020
20
A rook's tour of the chessboard
Jan 29, 2020
Top network posts
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56
What is the optimal number of dice to roll a Yahtzee in one roll?
43
What is the closed form of the $f$ with $f(1)=1$, $f(2)=7$ and $f(n)=7f(n-1)-12f(n-2)$ ($n\ge 3$)?
29
How to linearize the product of two binary variables?
25
Can we arrange $\{1,...,16\}$ in $4\times 4$-grid so {products of rows} = {products of columns}?
24
Is there a generating function for any finite sequence of random numbers?