Mathematics
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RobPratt
  • Member for 4 years, 3 months
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  • NC, USA
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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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All Questions Answers
Score Newest
answer
56
What is the optimal number of dice to roll a Yahtzee in one roll?
Feb 6, 2020
answer
40
What is the closed form of the $f$ with $f(1)=1$, $f(2)=7$ and $f(n)=7f(n-1)-12f(n-2)$ ($n\ge 3$)?
Jul 14, 2019
answer
23
Is there a generating function for any finite sequence of random numbers?
Apr 7, 2020
answer
19
Can we arrange $\{1,...,16\}$ in $4\times 4$-grid so {products of rows} = {products of columns}?
Jan 22, 2020
answer
15
Number of ways to label die with opposing faces summing to 7
Jan 1, 2020
answer
14
Does it exist a way how to find the ways to get from one point to another when certain points must be avoided in a grid?
Mar 21, 2020
answer
14
How to geometrically determine number of holes for a triangle
Dec 17, 2022
answer
12
Express $\sum_{j=1}^{n}\sum_{i=1}^{n} \frac{1}{i(i+j)}$ in terms of harmonic numbers
Jul 16, 2019
answer
11
With $x_1^2+3x_2^2+2x_1x_2=32$, find max value of $|x_1-x_2|$
Jul 4, 2022
answer
9
is it possible to divide $9\times 11$ rectangle into one $1\times 3$ rectangle and N tetrominoes?
Jan 16, 2020
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30
Checkmate 30 kings with rooks
24
How to linearize the product of two binary variables?
24
A COVID-19 puzzle: How large a class do you need to fit 30 pupils?
24
What node does 11 point to?
21
Three queens and two rooks covering the chess board... again!

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