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Algorithm C# to create all combination

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Last Modified: 2020-09-11
Hi there
i need to simulate something like a betting platform, so i need to create a procedure to list all combinations of a given set of objects
Basically, if i have a set of X object, i need to create all subset of Y, Z or W objects without ripetition
EXAMPLE:
x=8 , objects are (A,B,C,D,E,F,G,H)
y=7
z=6
I need to manage
all 7 combination of seven objects and all 28 combination of six objects (and obviously 1 combination with all eight objects) 
Order is no important, ripetion is not admitted.
We are using C# and we haven't specific requirements for performance and data structures
Please help, ask me for details if i wasn't clear..
Thanks!
M

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