9.5.3 Can you answer these questions?

9.5.3.1 Guessing patterns of symbolic series

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=279233

I have a system of  2s+1  equations, where  s  can take integer values of  {1,2,3,....,n} . Here ... 
[string-manipulation] [polynomials]
 

asked by Monire Jalili https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=62240 Score of 2

9.5.3.2 Discrete Markov Process generator

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=279422

... 
[markov-chains] [markov-process]
 

asked by Alkis Tsiatsios https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=90205 Score of 2

9.5.3.3 Why doesn't ParametricNDSolve execute the action of WhenEvent, except the first occurrence?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=279411

I'm trying to create a ParametricFunction object using ParametricNDSolve targeting a system of equations that involves WhenEvent and DiscreteVariables. For some reason I fail to discover, the ... 
[parametric-functions] [event-detection]
 

asked by adibognar https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=90247 Score of 2